Scala Standard Library2.13.18 < Back
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# Packages

-  package root

  This is the documentation for the Scala standard library.

  This is the documentation for the Scala standard library.

  #### Package structure

  The scala package contains core types like `Int`, `Float`, `Array` or `Option` which are accessible in all Scala compilation units without explicit qualification or imports.

  Notable packages include:

  - `scala.collection` and its sub-packages contain Scala's collections framework
    - `scala.collection.immutable` - Immutable, sequential data-structures such as `Vector`, `List`, `Range`, `HashMap` or `HashSet`
    - `scala.collection.mutable` - Mutable, sequential data-structures such as `ArrayBuffer`, `StringBuilder`, `HashMap` or `HashSet`
    - `scala.collection.concurrent` - Mutable, concurrent data-structures such as `TrieMap`
  - `scala.concurrent` - Primitives for concurrent programming such as `Futures` and `Promises`
  - `scala.io` - Input and output operations
  - `scala.math` - Basic math functions and additional numeric types like `BigInt` and `BigDecimal`
  - `scala.sys` - Interaction with other processes and the operating system
  - `scala.util.matching` - Regular expressions

  Other packages exist. See the complete list on the right.

  Additional parts of the standard library are shipped as separate libraries. These include:

  - `scala.reflect` - Scala's reflection API (scala-reflect.jar)
  - `scala.xml` - XML parsing, manipulation, and serialization (scala-xml.jar)
  - `scala.collection.parallel` - Parallel collections (scala-parallel-collections.jar)
  - `scala.util.parsing` - Parser combinators (scala-parser-combinators.jar)
  - `scala.swing` - A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)

  #### Automatic imports

  Identifiers in the scala package and the `scala.Predef` object are always in scope by default.

  Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example, `List` is an alias for `scala.collection.immutable.List`.

  Other aliases refer to classes provided by the underlying platform. For example, on the JVM, `String` is an alias for `java.lang.String`.

  Definition Classes
    root
-  package scala

  Core Scala types.

  Core Scala types. They are always available without an explicit import.

  Definition Classes
    root
-  package collection
  Definition Classes
    scala
-  package concurrent
  Definition Classes
    collection
-  package convert
  Definition Classes
    collection
-  package generic
  Definition Classes
    collection
-  package immutable
  Definition Classes
    collection
-  package mutable
  Definition Classes
    collection
- +:
- :+
- AbstractIndexedSeqView
- AbstractIterable
- AbstractIterator
- AbstractMap
- AbstractMapView
- AbstractSeq
- AbstractSeqView
- AbstractSet
- AbstractView
- AnyStepper
- ArrayOps
- BitSet
- BitSetOps
- BufferedIterator
- BuildFrom
- BuildFromLowPriority1
- BuildFromLowPriority2
- ClassTagIterableFactory
- ClassTagSeqFactory
- DefaultMap
- DoubleStepper
- EvidenceIterableFactory
- EvidenceIterableFactoryDefaults
- Factory
- Hashing
- IndexedSeq
- IndexedSeqOps
- IndexedSeqView
- IntStepper
- Iterable
- IterableFactory
- IterableFactoryDefaults
- IterableOnce
- IterableOnceExtensionMethods
- IterableOnceOps
- IterableOps
- Iterator
- JavaConverters
- LazyZip2
- LazyZip3
- LazyZip4
- LinearSeq
- LinearSeqOps
- LongStepper
- Map
- MapFactory
- MapFactoryDefaults
- MapOps
- MapView
- MapViewFactory
- Searching
- Seq
- SeqFactory
- SeqMap
- SeqOps
- SeqView
- Set
- SetOps
- SortedIterableFactory
- SortedMap
- SortedMapFactory
- SortedMapFactoryDefaults
- SortedMapOps
- SortedOps
- SortedSet
- SortedSetFactoryDefaults
- SortedSetOps
- SpecificIterableFactory
- Stepper
- StepperShape
- StepperShapeLowPriority1
- StepperShapeLowPriority2
- StrictOptimizedClassTagSeqFactory
- StrictOptimizedIterableOps
- StrictOptimizedLinearSeqOps
- StrictOptimizedMapOps
- StrictOptimizedSeqFactory
- StrictOptimizedSeqOps
- StrictOptimizedSetOps
- StrictOptimizedSortedMapOps
- StrictOptimizedSortedSetOps
- StringOps
- StringView
- View
- WithFilter

c

scala.collection

# AbstractView

###

#### abstract class AbstractView[+A] extends AbstractIterable[A] with View[A]

Explicit instantiation of the `View` trait to reduce class file size in subclasses.

Annotations
  @SerialVersionUID()
Source
  View.scala

Linear Supertypes
View[A], java.io.Serializable, AbstractIterable[A], Iterable[A], IterableFactoryDefaults[A, [x]View[x]], IterableOps[A, [_]View[_], View[A]], IterableOnceOps[A, [_]View[_], View[A]], IterableOnce[A], AnyRef, Any
Known Subclasses
AbstractIndexedSeqView, AbstractMapView, AbstractSeqView, Appended, Concat, Drop, DropRight, Id, Map, Prepended, Reverse, Slice, Take, TakeRight, Filter, FilterKeys, Id, MapValues, TapEach, Appended, Concat, Drop, DropRight, Id, Map, Prepended, Reverse, Take, TakeRight, StringView, Appended, Collect, Concat, DistinctBy, Drop, DropRight, DropWhile, Elems, Empty, Fill, Filter, FlatMap, Iterate, LeftPartitionMapped, Map, PadTo, Prepended, RightPartitionMapped, ScanLeft, Single, Tabulate, Take, TakeRight, TakeWhile, Unfold, Updated, Zip, ZipAll, ZipWithIndex, ArrayBufferView
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. AbstractView
2. View
3. Serializable
4. AbstractIterable
5. Iterable
6. IterableFactoryDefaults
7. IterableOps
8. IterableOnceOps
9. IterableOnce
10. AnyRef
11. Any

Implicitly

1. by iterableOnceExtensionMethods
2. by any2stringadd
3. by StringFormat
4. by Ensuring
5. by ArrowAssoc

1. Hide All
2. Show All

Visibility

1. Public
2. Protected

### Instance Constructors

1.  new AbstractView()

### Abstract Value Members

1.  abstract def iterator: Iterator[A]

   An scala.collection.Iterator over the elements of this view.

   An scala.collection.Iterator over the elements of this view.

   If an `IterableOnce` object is in fact an scala.collection.Iterator, this method always returns itself, in its current state, but if it is an scala.collection.Iterable, this method always returns a new scala.collection.Iterator.

   Definition Classes
     IterableOnce

### Concrete Value Members

1.  final def !=(arg0: Any): Boolean

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     AnyRef → Any
2.  final def ##: Int

   Equivalent to `x.hashCode` except for boxed numeric types and `null`.

   Equivalent to `x.hashCode` except for boxed numeric types and `null`. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For `null` returns a hashcode where `null.hashCode` throws a `NullPointerException`.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any
3.  def +(other: String): String
   Implicit
     This member is added by an implicit conversion from AbstractView[A] toany2stringadd[AbstractView[A]] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  final def ++[B >: A](suffix: IterableOnce[B]): View[B]

   Alias for `concat`

   Alias for `concat`

   Definition Classes
     IterableOps
   Annotations
     @inline()
5.  def ->[B](y: B): (AbstractView[A], B)
   Implicit
     This member is added by an implicit conversion from AbstractView[A] toArrowAssoc[AbstractView[A]] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()
6.  final def ==(arg0: Any): Boolean

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   Definition Classes
     AnyRef → Any
7.  final def addString(b: mutable.StringBuilder): b.type

   Appends all elements of this view to a string builder.

   Appends all elements of this view to a string builder. The written text consists of the string representations (w.r.t. the method `toString`) of all elements of this view without any separator string.

   Example:

       scala> val a = List(1,2,3,4)
       a: List[Int] = List(1, 2, 3, 4)

       scala> val b = new StringBuilder()
       b: StringBuilder =

       scala> val h = a.addString(b)
       h: StringBuilder = 1234

   b

     the string builder to which elements are appended.

   returns

     the string builder `b` to which elements were appended.

   Definition Classes
     IterableOnceOps
   Annotations
     @inline()
8.  final def addString(b: mutable.StringBuilder, sep: String): b.type

   Appends all elements of this view to a string builder using a separator string.

   Appends all elements of this view to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method `toString`) of all elements of this view, separated by the string `sep`.

   Example:

       scala> val a = List(1,2,3,4)
       a: List[Int] = List(1, 2, 3, 4)

       scala> val b = new StringBuilder()
       b: StringBuilder =

       scala> a.addString(b, ", ")
       res0: StringBuilder = 1, 2, 3, 4

   b

     the string builder to which elements are appended.

   sep

     the separator string.

   returns

     the string builder `b` to which elements were appended.

   Definition Classes
     IterableOnceOps
   Annotations
     @inline()
9.  def addString(b: mutable.StringBuilder, start: String, sep: String, end: String): b.type

   Appends all elements of this view to a string builder using start, end, and separator strings.

   Appends all elements of this view to a string builder using start, end, and separator strings. The written text begins with the string `start` and ends with the string `end`. Inside, the string representations (w.r.t. the method `toString`) of all elements of this view are separated by the string `sep`.

   Example:

       scala> val a = List(1,2,3,4)
       a: List[Int] = List(1, 2, 3, 4)

       scala> val b = new StringBuilder()
       b: StringBuilder =

       scala> a.addString(b , "List(" , ", " , ")")
       res5: StringBuilder = List(1, 2, 3, 4)

   b

     the string builder to which elements are appended.

   start

     the starting string.

   sep

     the separator string.

   end

     the ending string.

   returns

     the string builder `b` to which elements were appended.

   Definition Classes
     IterableOnceOps
10.  final def asInstanceOf[T0]: T0

    Forces the compiler to treat the receiver object as having type `T0`, even though doing so may violate type safety.

    Forces the compiler to treat the receiver object as having type `T0`, even though doing so may violate type safety.

    This method is useful when you believe you have type information the compiler doesn't, and it also isn't possible to check the type at runtime. In such situations, skipping type safety is the only option.

    It is platform dependent whether `asInstanceOf` has any effect at runtime. It might do a runtime type test on the erasure of `T0`, insert a conversion (such as boxing/unboxing), fill in a default value, or do nothing at all.

    In particular, `asInstanceOf` is not a type test. It does **not** mean:

        this match {
         case x: T0 => x
         case _     => throw ClassCastException("...")

    Use pattern matching or isInstanceOf for type testing instead.

    Situations where `asInstanceOf` is useful:

    - when flow analysis fails to deduce `T0` automatically
    - when down-casting a type parameter or an abstract type member (which cannot be checked at runtime due to type erasure) If there is any doubt and you are able to type test instead, you should do so.

    Be careful of using `asInstanceOf` when `T0` is a primitive type. When `T0` is primitive, `asInstanceOf` may insert a conversion instead of a type test. If your intent is to convert, use a `toT` method (`x.toChar`, `x.toByte`, etc.).

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver is not an instance of the erasure of `T0`, if that can be checked on this platform

11.  def className: String

    Defines the prefix of this object's `toString` representation.

    Defines the prefix of this object's `toString` representation.

    It is recommended to return the name of the concrete collection type, but not implementation subclasses. For example, for `ListMap` this method should return `"ListMap"`, not `"Map"` (the supertype) or `"Node"` (an implementation subclass).

    The default implementation returns "Iterable". It is overridden for the basic collection kinds "Seq", "IndexedSeq", "LinearSeq", "Buffer", "Set", "Map", "SortedSet", "SortedMap" and "View".

    returns

      a string representation which starts the result of `toString` applied to this view. By default the string prefix is the simple name of the collection class view.

    Attributes
      protected[this]
    Definition Classes
      Iterable
12.  def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.CloneNotSupportedException]) @native()
    Note

      not specified by SLS as a member of AnyRef

13.  final def coll: AbstractView.this.type

    returns

      This collection as a `C`.

    Attributes
      protected
    Definition Classes
      Iterable → IterableOps
14.  def collect[B](pf: PartialFunction[A, B]): View[B]

    Builds a new view by applying a partial function to all elements of this view on which the function is defined.

    Builds a new view by applying a partial function to all elements of this view on which the function is defined.

    B

      the element type of the returned view.

    pf

      the partial function which filters and maps the view.

    returns

      a new view resulting from applying the given partial function `pf` to each element on which it is defined and collecting the results. The order of the elements is preserved.

    Definition Classes
      IterableOps → IterableOnceOps
15.  def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

    Finds the first element of the view for which the given partial function is defined, and applies the partial function to it.

    Finds the first element of the view for which the given partial function is defined, and applies the partial function to it.

    Note: may not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    pf

      the partial function

    returns

      an option value containing pf applied to the first value for which it is defined, or `None` if none exists.

    Definition Classes
      IterableOnceOps
    Example:

    1. `Seq("a", 1, 5L).collectFirst { case x: Int => x*10 } = Some(10)`

16.  def concat[B >: A](suffix: IterableOnce[B]): View[B]

    Returns a new view containing the elements from the left hand operand followed by the elements from the right hand operand.

    Returns a new view containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the view is the most specific superclass encompassing the element types of the two operands.

    B

      the element type of the returned collection.

    suffix

      the iterable to append.

    returns

      a new view which contains all elements of this view followed by all elements of `suffix`.

    Definition Classes
      IterableOps
17.  def copyToArray[B >: A](dest: Array[B], start: Int, n: Int): Int

    Copies elements to an array and returns the number of elements written.

    Copies elements to an array and returns the number of elements written.

    Fills the given array `dest` starting at index `start` with at most `n` elements of this view.

    Copying will stop once either all the elements of this view have been copied, or the end of the array is reached, or `n` elements have been copied.

    If `start` is less than zero, it is taken as zero.

    B

      the type of the elements of the array.

    dest

      the array to fill.

    start

      the starting index of xs.

    n

      the maximal number of elements to copy.

    returns

      the number of elements written to the array

    Definition Classes
      IterableOnceOps
    Note

      Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

18.  def copyToArray[B >: A](dest: Array[B], start: Int): Int

    Copies elements to an array, returning the number of elements written.

    Copies elements to an array, returning the number of elements written.

    Fills the given array `dest` starting at index `start` with values of this view.

    Copying will stop once either all the elements of this view have been copied, or the end of the array is reached.

    B

      the type of the elements of the array.

    dest

      the array to fill.

    start

      the starting index of xs.

    returns

      the number of elements written to the array

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecatedOverriding()
    Note

      Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

19.  def copyToArray[B >: A](dest: Array[B]): Int

    Copies elements to an array, returning the number of elements written.

    Copies elements to an array, returning the number of elements written.

    Fills the given array `dest` starting at index `start` with values of this view.

    Copying will stop once either all the elements of this view have been copied, or the end of the array is reached.

    B

      the type of the elements of the array.

    dest

      the array to fill.

    returns

      the number of elements written to the array

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecatedOverriding()
    Note

      Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change.

20.  def corresponds[B](that: IterableOnce[B])(p: (A, B) => Boolean): Boolean

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    Note: will not terminate for infinite-sized collections.

    B

      the type of the elements of `that`

    that

      the other collection

    p

      the test predicate, which relates elements from both collections

    returns

      `true` if both collections have the same length and `p(x, y)` is `true` for all corresponding elements `x` of this iterator and `y` of `that`, otherwise `false`

    Definition Classes
      IterableOnceOps
21.  def count(p: (A) => Boolean): Int

    Counts the number of elements in the view which satisfy a predicate.

    Counts the number of elements in the view which satisfy a predicate.

    Note: will not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      IterableOnceOps
22.  def drop(n: Int): View[A]

    Selects all elements except the first `n` ones.

    Selects all elements except the first `n` ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

      the number of elements to drop from this view.

    returns

      a view consisting of all elements of this view except the first `n` ones, or else the empty view, if this view has less than `n` elements. If `n` is negative, don't drop any elements.

    Definition Classes
      IterableOps → IterableOnceOps
23.  def dropRight(n: Int): View[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

      the number of elements to drop from this view.

    returns

      a view consisting of all elements of this view except the last `n` ones, or else the empty view, if this view has less than `n` elements. If `n` is negative, don't drop any elements.

    Definition Classes
      IterableOps
24.  def dropWhile(p: (A) => Boolean): View[A]

    Selects all elements except the longest prefix that satisfies a predicate.

    Selects all elements except the longest prefix that satisfies a predicate.

    The matching prefix starts with the first element of this view, and the element following the prefix is the first element that does not satisfy the predicate. The matching prefix may be empty, so that this method returns the entire view.

    Example:

        scala> List(1, 2, 3, 100, 4).dropWhile(n => n < 10)
        val res0: List[Int] = List(100, 4)

        scala> List(1, 2, 3, 100, 4).dropWhile(n => n == 0)
        val res1: List[Int] = List(1, 2, 3, 100, 4)

    Use span to obtain both the prefix and suffix. Use filterNot to drop all elements that satisfy the predicate.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

      The predicate used to test elements.

    returns

      the longest suffix of this view whose first element does not satisfy the predicate `p`.

    Definition Classes
      IterableOps → IterableOnceOps
25.  def empty: View[A]

    The empty view.

    The empty view.

    returns

      an empty iterable of type `View`.

    Definition Classes
      View → IterableFactoryDefaults → IterableOps
26.  def ensuring(cond: (AbstractView[A]) => Boolean, msg: => Any): AbstractView[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toEnsuring[AbstractView[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
27.  def ensuring(cond: (AbstractView[A]) => Boolean): AbstractView[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toEnsuring[AbstractView[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
28.  def ensuring(cond: Boolean, msg: => Any): AbstractView[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toEnsuring[AbstractView[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
29.  def ensuring(cond: Boolean): AbstractView[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toEnsuring[AbstractView[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
30.  final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    Tests whether the argument (`that`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef
31.  def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      AnyRef → Any
32.  def exists(p: (A) => Boolean): Boolean

    Tests whether a predicate holds for at least one element of this view.

    Tests whether a predicate holds for at least one element of this view.

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` is satisfied by at least one element of this view, otherwise `false`

    Definition Classes
      IterableOnceOps
33.  def filter(pred: (A) => Boolean): View[A]

    Selects all elements of this view which satisfy a predicate.

    Selects all elements of this view which satisfy a predicate.

    returns

      a new view consisting of all elements of this view that satisfy the given predicate `p`. The order of the elements is preserved.

    Definition Classes
      IterableOps → IterableOnceOps
34.  def filterNot(pred: (A) => Boolean): View[A]

    Selects all elements of this view which do not satisfy a predicate.

    Selects all elements of this view which do not satisfy a predicate.

    pred

      the predicate used to test elements.

    returns

      a new view consisting of all elements of this view that do not satisfy the given predicate `pred`. Their order may not be preserved.

    Definition Classes
      IterableOps → IterableOnceOps
35.  def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
    Note

      not specified by SLS as a member of AnyRef

36.  def find(p: (A) => Boolean): Option[A]

    Finds the first element of the view satisfying a predicate, if any.

    Finds the first element of the view satisfying a predicate, if any.

    Note: may not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

      the predicate used to test elements.

    returns

      an option value containing the first element in the view that satisfies `p`, or `None` if none exists.

    Definition Classes
      IterableOnceOps
37.  def flatMap[B](f: (A) => IterableOnce[B]): View[B]

    Builds a new view by applying a function to all elements of this view and using the elements of the resulting collections.

    Builds a new view by applying a function to all elements of this view and using the elements of the resulting collections.

    For example:

        def getWords(lines: Seq[String]): Seq[String] = lines.flatMap(line => line.split("\\W+"))

    The type of the resulting collection is guided by the static type of this view. This might cause unexpected results sometimes. For example:

        // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
        def lettersOf(words: Seq[String]) = words.flatMap(word => word.toSet)

        // lettersOf will return a Set[Char], not a Seq
        def lettersOf(words: Seq[String]) = words.toSet.flatMap(word => word.toSeq)

        // xs will be an Iterable[Int]
        val xs = Map("a" -> List(11, 111), "b" -> List(22, 222)).flatMap(_._2)

        // ys will be a Map[Int, Int]
        val ys = Map("a" -> List(1 -> 11, 1 -> 111), "b" -> List(2 -> 22, 2 -> 222)).flatMap(_._2)

    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

      a new view resulting from applying the given collection-valued function `f` to each element of this view and concatenating the results.

    Definition Classes
      IterableOps → IterableOnceOps
38.  def flatten[B](implicit asIterable: (A) => IterableOnce[B]): View[B]

    Given that the elements of this collection are themselves iterable collections, converts this view into a view comprising the elements of these iterable collections.

    Given that the elements of this collection are themselves iterable collections, converts this view into a view comprising the elements of these iterable collections.

    The resulting collection's type will be guided by the type of view. For example:

        val xs = List(
                   Set(1, 2, 3),
                   Set(1, 2, 3)
                 ).flatten
        // xs == List(1, 2, 3, 1, 2, 3)

        val ys = Set(
                   List(1, 2, 3),
                   List(3, 2, 1)
                 ).flatten
        // ys == Set(1, 2, 3)

    B

      the type of the elements of each iterable collection.

    asIterable

      an implicit conversion which asserts that the element type of this view is an `Iterable`.

    returns

      a new view resulting from concatenating all element collections.

    Definition Classes
      IterableOps → IterableOnceOps
39.  def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1

    Applies the given binary operator `op` to the given initial value `z` and all elements of this view.

    Applies the given binary operator `op` to the given initial value `z` and all elements of this view.

    For each application of the operator, each operand is either an element of this view, the initial value, or another such application of the operator.

    The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation. The initial value may be used an arbitrary number of times, but at least once.

    If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative. In either case, it is also necessary that the initial value be a neutral value for the operator, e.g. `Nil` for `List` concatenation or `1` for multiplication.

    The default implementation in `IterableOnce` is equivalent to `foldLeft` but may be overridden for more efficient traversal orders.

    Note: will not terminate for infinite-sized collections.

    A1

      The type parameter for the binary operator, a supertype of `A`.

    z

      An initial value; may be used an arbitrary number of times in the computation of the result; must be a neutral value for `op` for the result to always be the same across runs.

    op

      A binary operator; must be associative for the result to always be the same across runs.

    returns

      The result of applying `op` between all the elements and `z`, or `z` if this view is empty.

    Definition Classes
      IterableOnceOps
40.  def foldLeft[B](z: B)(op: (B, A) => B): B

    Applies the given binary operator `op` to the given initial value `z` and all elements of this view, going left to right.

    Applies the given binary operator `op` to the given initial value `z` and all elements of this view, going left to right. Returns the initial value if this view is empty.

    "Going left to right" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this view, the result is `op( op( ... op( op(z, x1), x2) ... ), xn)`.

    If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the initial value, and each other left operand is itself an application of the operator. The elements of this view and the initial value all appear exactly once in the computation.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator.

    z

      An initial value.

    op

      A binary operator.

    returns

      The result of applying `op` to `z` and all elements of this view, going left to right. Returns `z` if this view is empty.

    Definition Classes
      IterableOnceOps
41.  def foldRight[B](z: B)(op: (A, B) => B): B

    Applies the given binary operator `op` to all elements of this view and the given initial value `z`, going right to left.

    Applies the given binary operator `op` to all elements of this view and the given initial value `z`, going right to left. Returns the initial value if this view is empty.

    "Going right to left" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this view, the result is `op(x1, op(x2, op( ... op(xn, z) ... )))`.

    If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the initial value, and each other right operand is itself an application of the operator. The elements of this view and the initial value all appear exactly once in the computation.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator.

    z

      An initial value.

    op

      A binary operator.

    returns

      The result of applying `op` to all elements of this view and `z`, going right to left. Returns `z` if this view is empty.

    Definition Classes
      IterableOnceOps
42.  def forall(p: (A) => Boolean): Boolean

    Tests whether a predicate holds for all elements of this view.

    Tests whether a predicate holds for all elements of this view.

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      `true` if this view is empty or the given predicate `p` holds for all elements of this view, otherwise `false`.

    Definition Classes
      IterableOnceOps
43.  def foreach[U](f: (A) => U): Unit

    Applies `f` to each element for its side effects.

    Applies `f` to each element for its side effects. Note: `U` parameter needed to help scalac's type inference.

    Definition Classes
      IterableOnceOps
44.  def fromSpecific(coll: IterableOnce[A]): View[A]

    Defines how to turn a given `Iterable[A]` into a collection of type `C`.

    Defines how to turn a given `Iterable[A]` into a collection of type `C`.

    This process can be done in a strict way or a non-strict way (ie. without evaluating the elements of the resulting collections). In other words, this methods defines the evaluation model of the collection.

    Attributes
      protected
    Definition Classes
      IterableFactoryDefaults → IterableOps
    Note

      When implementing a custom collection type and refining `C` to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where `C =:= CC[A]`, this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.

      ,

      As witnessed by the `@uncheckedVariance` annotation, using this method might be unsound. However, as long as it is called with an `Iterable[A]` obtained from `this` collection (as it is the case in the implementations of operations where we use a `View[A]`), it is safe.

45.  final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

      a class object corresponding to the runtime type of the receiver.

    Definition Classes
      AnyRef → Any
    Annotations
      @native()
46.  def groupBy[K](f: (A) => K): immutable.Map[K, View[A]]

    Partitions this view into a map of views according to some discriminator function.

    Partitions this view into a map of views according to some discriminator function.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

      A map from keys to views such that the following invariant holds:

          (xs groupBy f)(k) = xs filter (x => f(x) == k)

      That is, every key `k` is bound to a view of those elements `x` for which `f(x)` equals `k`.

    Definition Classes
      IterableOps
47.  def groupMap[K, B](key: (A) => K)(f: (A) => B): immutable.Map[K, View[B]]

    Partitions this view into a map of views according to a discriminator function `key`.

    Partitions this view into a map of views according to a discriminator function `key`. Each element in a group is transformed into a value of type `B` using the `value` function.

    It is equivalent to `groupBy(key).mapValues(_.map(f))`, but more efficient.

        case class User(name: String, age: Int)

        def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
          users.groupMap(_.age)(_.name)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

      the type of keys returned by the discriminator function

    B

      the type of values returned by the transformation function

    key

      the discriminator function

    f

      the element transformation function

    Definition Classes
      IterableOps
48.  def groupMapReduce[K, B](key: (A) => K)(f: (A) => B)(reduce: (B, B) => B): immutable.Map[K, B]

    Partitions this view into a map according to a discriminator function `key`.

    Partitions this view into a map according to a discriminator function `key`. All the values that have the same discriminator are then transformed by the `f` function and then reduced into a single value with the `reduce` function.

    It is equivalent to `groupBy(key).mapValues(_.map(f).reduce(reduce))`, but more efficient.

        def occurrences[A](as: Seq[A]): Map[A, Int] =
          as.groupMapReduce(identity)(_ => 1)(_ + _)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Definition Classes
      IterableOps
49.  def grouped(size: Int): Iterator[View[A]]

    Partitions elements in fixed size views.

    Partitions elements in fixed size views.

    size

      the number of elements per group

    returns

      An iterator producing views of size `size`, except the last will be less than size `size` if the elements don't divide evenly.

    Definition Classes
      IterableOps
    See also

      scala.collection.Iterator, method `grouped`

50.  def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

      the hash code value for this object.

    Definition Classes
      AnyRef → Any
    Annotations
      @native()
51.  def head: A

    Selects the first element of this view.

    Selects the first element of this view.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      the first element of this view.

    Definition Classes
      IterableOps
    Exceptions thrown

      `NoSuchElementException` if the view is empty.

52.  def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      the first element of this view if it is nonempty, `None` if it is empty.

    Definition Classes
      IterableOps
53.  def init: View[A]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Definition Classes
      IterableOps
54.  def inits: Iterator[View[A]]

    Iterates over the inits of this view.

    Iterates over the inits of this view. The first value will be this view and the final one will be an empty view, with the intervening values the results of successive applications of `init`.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

      an iterator over all the inits of this view

    Definition Classes
      IterableOps
    Example:

    1. `List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)`

55.  def isEmpty: Boolean

    Tests whether the view is empty.

    Tests whether the view is empty.

    Note: The default implementation creates and discards an iterator.

    Note: Implementations in subclasses that are not repeatedly iterable must take care not to consume any elements when `isEmpty` is called.

    returns

      `true` if the view contains no elements, `false` otherwise.

    Definition Classes
      IterableOnceOps
56.  final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object has the same erasure as `T0`.

    Test whether the dynamic type of the receiver object has the same erasure as `T0`.

    Depending on what `T0` is, the test is done in one of the below ways:

    - `T0` is a non-parameterized class type, e.g. `BigDecimal`: this method returns `true` if the value of the receiver object is a `BigDecimal` or a subtype of `BigDecimal`.
    - `T0` is a parameterized class type, e.g. `List[Int]`: this method returns `true` if the value of the receiver object is some `List[X]` for any `X`. For example, `List(1, 2, 3).isInstanceOf[List[String]]` will return true.
    - `T0` is some singleton type `x.type` or literal `x`: this method returns `this.eq(x)`. For example, `x.isInstanceOf[1]` is equivalent to `x.eq(1)`
    - `T0` is an intersection `X with Y` or `X & Y: this method is equivalent to` x.isInstanceOf[X] && x.isInstanceOf[Y]``
    - `T0` is a union `X | Y`: this method is equivalent to `x.isInstanceOf[X] || x.isInstanceOf[Y]`
    - `T0` is a type parameter or an abstract type member: this method is equivalent to `isInstanceOf[U]` where `U` is `T0`'s upper bound, `Any` if `T0` is unbounded. For example, `x.isInstanceOf[A]` where `A` is an unbounded type parameter will return true for any value of `x`.

    This is exactly equivalent to the type pattern `_: T0`

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    Definition Classes
      Any
    Note

      due to the unexpectedness of `List(1, 2, 3).isInstanceOf[List[String]]` returning true and `x.isInstanceOf[A]` where `A` is a type parameter or abstract member returning true, these forms issue a warning.

57.  def isTraversableAgain: Boolean

    Tests whether this view can be repeatedly traversed.

    Tests whether this view can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.

    returns

      `true` if it is repeatedly traversable, `false` otherwise.

    Definition Classes
      IterableOps → IterableOnceOps
58.  def iterableFactory: IterableFactory[View]

    The companion object of this view, providing various factory methods.

    The companion object of this view, providing various factory methods.

    Definition Classes
      View → Iterable → IterableOps
    Note

      When implementing a custom collection type and refining `CC` to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).

59.  def knownSize: Int

    The number of elements in this view, if it can be cheaply computed, -1 otherwise.

    The number of elements in this view, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

    Definition Classes
      IterableOnce
60.  def last: A

    Selects the last element.

    Selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      The last element of this view.

    Definition Classes
      IterableOps
    Exceptions thrown

      `NoSuchElementException` If the view is empty.

61.  def lastOption: Option[A]

    Optionally selects the last element.

    Optionally selects the last element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      the last element of this view if it is nonempty, `None` if it is empty.

    Definition Classes
      IterableOps
62.  def lazyZip[B](that: Iterable[B]): LazyZip2[A, B, AbstractView.this.type]

    Analogous to `zip` except that the elements in each collection are not consumed until a strict operation is invoked on the returned `LazyZip2` decorator.

    Analogous to `zip` except that the elements in each collection are not consumed until a strict operation is invoked on the returned `LazyZip2` decorator.

    Calls to `lazyZip` can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

        val xs = List(1, 2, 3)
        val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
        // res == List(4, 8, 12)

    B

      the type of the second element in each eventual pair

    that

      the iterable providing the second element of each eventual pair

    returns

      a decorator `LazyZip2` that allows strict operations to be performed on the lazily evaluated pairs or chained calls to `lazyZip`. Implicit conversion to `Iterable[(A, B)]` is also supported.

    Definition Classes
      Iterable
63.  def map[B](f: (A) => B): View[B]

    Builds a new view by applying a function to all elements of this view.

    Builds a new view by applying a function to all elements of this view.

    B

      the element type of the returned view.

    f

      the function to apply to each element.

    returns

      a new view resulting from applying the given function `f` to each element of this view and collecting the results.

    Definition Classes
      IterableOps → IterableOnceOps
64.  def max[B >: A](implicit ord: math.Ordering[B]): A

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

      the largest element of this view with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

65.  def maxBy[B](f: (A) => B)(implicit ord: math.Ordering[B]): A

    Finds the first element which yields the largest value measured by function `f`.

    Finds the first element which yields the largest value measured by function `f`.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      the first element of this view with the largest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

66.  def maxByOption[B](f: (A) => B)(implicit ord: math.Ordering[B]): Option[A]

    Finds the first element which yields the largest value measured by function `f`.

    Finds the first element which yields the largest value measured by function `f`.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      an option value containing the first element of this view with the largest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
67.  def maxOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

      an option value containing the largest element of this view with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
68.  def min[B >: A](implicit ord: math.Ordering[B]): A

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

      the smallest element of this view with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

69.  def minBy[B](f: (A) => B)(implicit ord: math.Ordering[B]): A

    Finds the first element which yields the smallest value measured by function `f`.

    Finds the first element which yields the smallest value measured by function `f`.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      the first element of this view with the smallest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

70.  def minByOption[B](f: (A) => B)(implicit ord: math.Ordering[B]): Option[A]

    Finds the first element which yields the smallest value measured by function `f`.

    Finds the first element which yields the smallest value measured by function `f`.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the function `f`.

    f

      The measuring function.

    ord

      An ordering to be used for comparing elements.

    returns

      an option value containing the first element of this view with the smallest value measured by function `f` with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
71.  def minOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

      The type over which the ordering is defined.

    ord

      An ordering to be used for comparing elements.

    returns

      an option value containing the smallest element of this view with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
72.  final def mkString: String

    Displays all elements of this view in a string.

    Displays all elements of this view in a string.

    Delegates to addString, which can be overridden.

    returns

      a string representation of this view. In the resulting string the string representations (w.r.t. the method `toString`) of all elements of this view follow each other without any separator string.

    Definition Classes
      IterableOnceOps
    Annotations
      @inline()
73.  final def mkString(sep: String): String

    Displays all elements of this view in a string using a separator string.

    Displays all elements of this view in a string using a separator string.

    Delegates to addString, which can be overridden.

    sep

      the separator string.

    returns

      a string representation of this view. In the resulting string the string representations (w.r.t. the method `toString`) of all elements of this view are separated by the string `sep`.

    Definition Classes
      IterableOnceOps
    Annotations
      @inline()
    Example:

    1. `List(1, 2, 3).mkString("|") = "1|2|3"`

74.  final def mkString(start: String, sep: String, end: String): String

    Displays all elements of this view in a string using start, end, and separator strings.

    Displays all elements of this view in a string using start, end, and separator strings.

    Delegates to addString, which can be overridden.

    start

      the starting string.

    sep

      the separator string.

    end

      the ending string.

    returns

      a string representation of this view. The resulting string begins with the string `start` and ends with the string `end`. Inside, the string representations (w.r.t. the method `toString`) of all elements of this view are separated by the string `sep`.

    Definition Classes
      IterableOnceOps
    Example:

    1. `List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"`

75.  final def ne(arg0: AnyRef): Boolean

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

      `true` if the argument is not a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef
76.  def newSpecificBuilder: Builder[A, View[A]]

    returns

      a strict builder for the same collection type. Note that in the case of lazy collections (e.g. scala.collection.View or scala.collection.immutable.LazyList), it is possible to implement this method but the resulting `Builder` will break laziness. As a consequence, operations should preferably be implemented with `fromSpecific` instead of this method.

    Attributes
      protected
    Definition Classes
      IterableFactoryDefaults → IterableOps
    Note

      When implementing a custom collection type and refining `C` to the new type, this method needs to be overridden (the compiler will issue an error otherwise). In the common case where `C =:= CC[A]`, this can be done by mixing in the scala.collection.IterableFactoryDefaults trait, which implements the method using iterableFactory.

      ,

      As witnessed by the `@uncheckedVariance` annotation, using this method might be unsound. However, as long as the returned builder is only fed with `A` values taken from `this` instance, it is safe.

77.  def nonEmpty: Boolean

    Tests whether the view is not empty.

    Tests whether the view is not empty.

    returns

      `true` if the view contains at least one element, `false` otherwise.

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecatedOverriding()
78.  final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Annotations
      @native()
    Note

      not specified by SLS as a member of AnyRef

79.  final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Annotations
      @native()
    Note

      not specified by SLS as a member of AnyRef

80.  def partition(p: (A) => Boolean): (View[A], View[A])

    A pair of, first, all elements that satisfy predicate `p` and, second, all elements that do not.

    A pair of, first, all elements that satisfy predicate `p` and, second, all elements that do not.

    The two view correspond to the result of filter and filterNot, respectively.

    The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of `partition` in `StrictOptimizedIterableOps`, which requires only a single traversal.

    Definition Classes
      IterableOps
81.  def partitionMap[A1, A2](f: (A) => Either[A1, A2]): (View[A1], View[A2])

    Applies a function `f` to each element of the view and returns a pair of views: the first one made of those values returned by `f` that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Applies a function `f` to each element of the view and returns a pair of views: the first one made of those values returned by `f` that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Example:

        val xs = `View`(1, "one", 2, "two", 3, "three") partitionMap {
         case i: Int => Left(i)
         case s: String => Right(s)
        }
        // xs == (`View`(1, 2, 3),
        //        `View`(one, two, three))

    A1

      the element type of the first resulting collection

    A2

      the element type of the second resulting collection

    f

      the 'split function' mapping the elements of this view to an scala.util.Either

    returns

      a pair of views: the first one made of those values returned by `f` that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Definition Classes
      IterableOps
82.  def product[B >: A](implicit num: math.Numeric[B]): B

    Multiplies together the elements of this collection.

    Multiplies together the elements of this collection.

    The default implementation uses `reduce` for a known non-empty collection, `foldLeft` otherwise.

    Note: will not terminate for infinite-sized collections.

    B

      the result type of the `*` operator.

    num

      an implicit parameter defining a set of numeric operations which includes the `*` operator to be used in forming the product.

    returns

      the product of all elements of this view with respect to the `*` operator in `num`.

    Definition Classes
      IterableOnceOps
83.  def reduce[B >: A](op: (B, B) => B): B

    Applies the given binary operator `op` to all elements of this view.

    Applies the given binary operator `op` to all elements of this view.

    For each application of the operator, each operand is either an element of this view or another such application of the operator. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.

    If this collection is ordered, then for any application of the operator, the element(s) appearing in the left operand will precede those in the right.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

      The type parameter for the binary operator, a supertype of `A`.

    op

      A binary operator; must be associative for the result to always be the same across runs.

    returns

      The result of applying `op` between all the elements if the view is nonempty.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

84.  def reduceLeft[B >: A](op: (B, A) => B): B

    Applies the given binary operator `op` to all elements of this view, going left to right.

    Applies the given binary operator `op` to all elements of this view, going left to right.

    "Going left to right" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this view, the result is `op( op( op( ... op(x1, x2) ... ), xn-1), xn)`.

    If this collection is not ordered, then for each application of the operator, each right operand is an element. In addition, the leftmost operand is the first element of this view and each other left operand is itself an application of the operator. Each element appears exactly once in the computation.

    Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator, a supertype of `A`.

    op

      A binary operator.

    returns

      The result of applying `op` to all elements of this view, going left to right.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

85.  def reduceLeftOption[B >: A](op: (B, A) => B): Option[B]

    If this view is nonempty, reduces it with the given binary operator `op`, going left to right.

    If this view is nonempty, reduces it with the given binary operator `op`, going left to right.

    The behavior is the same as reduceLeft except that the value is `None` if the view is empty. Each element appears exactly once in the computation.

    Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator, a supertype of `A`.

    op

      A binary operator.

    returns

      The result of reducing this view with `op` going left to right if the view is nonempty, inside a `Some`, and `None` otherwise.

    Definition Classes
      IterableOnceOps
86.  def reduceOption[B >: A](op: (B, B) => B): Option[B]

    If this view is nonempty, reduces it with the given binary operator `op`.

    If this view is nonempty, reduces it with the given binary operator `op`.

    The behavior is the same as reduce except that the value is `None` if the view is empty. The order of applications of the operator is unspecified and may be nondeterministic. Each element appears exactly once in the computation.

    Note: might return different results for different runs, unless either of the following conditions is met: (1) the operator is associative, and the underlying collection type is ordered; or (2) the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

      A type parameter for the binary operator, a supertype of `A`.

    op

      A binary operator; must be associative for the result to always be the same across runs.

    returns

      The result of reducing this view with `op` if the view is nonempty, inside a `Some`, and `None` otherwise.

    Definition Classes
      IterableOnceOps
87.  def reduceRight[B >: A](op: (A, B) => B): B

    Applies the given binary operator `op` to all elements of this view, going right to left.

    Applies the given binary operator `op` to all elements of this view, going right to left.

    "Going right to left" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this view, the result is `op(x1, op(x2, op( ... op(xn-1, xn) ... )))`.

    If this collection is not ordered, then for each application of the operator, each left operand is an element. In addition, the rightmost operand is the last element of this view and each other right operand is itself an application of the operator. Each element appears exactly once in the computation.

    Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator, a supertype of `A`.

    op

      A binary operator.

    returns

      The result of applying `op` to all elements of this view, going right to left.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this view is empty.

88.  def reduceRightOption[B >: A](op: (A, B) => B): Option[B]

    If this view is nonempty, reduces it with the given binary operator `op`, going right to left.

    If this view is nonempty, reduces it with the given binary operator `op`, going right to left.

    The behavior is the same as reduceRight except that the value is `None` if the view is empty. Each element appears exactly once in the computation.

    Note: might return different results for different runs, unless the underlying collection type is ordered or the operator is associative and commutative.

    Note: will not terminate for infinite-sized collections.

    B

      The result type of the binary operator, a supertype of `A`.

    op

      A binary operator.

    returns

      The result of reducing this view with `op` going right to left if the view is nonempty, inside a `Some`, and `None` otherwise.

    Definition Classes
      IterableOnceOps
89.  def reversed: Iterable[A]
    Attributes
      protected
    Definition Classes
      IterableOnceOps
90.  def scan[B >: A](z: B)(op: (B, B) => B): View[B]

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

    Note: The neutral element `z` may be applied more than once.

    B

      element type of the resulting collection

    z

      neutral element for the operator `op`

    op

      the associative operator for the scan

    returns

      a new view containing the prefix scan of the elements in this view

    Definition Classes
      IterableOps
91.  def scanLeft[B](z: B)(op: (B, A) => B): View[B]

    Produces a view containing cumulative results of applying the operator going left to right, including the initial value.

    Produces a view containing cumulative results of applying the operator going left to right, including the initial value.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    B

      the type of the elements in the resulting collection

    z

      the initial value

    op

      the binary operator applied to the intermediate result and the element

    returns

      collection with intermediate results

    Definition Classes
      IterableOps → IterableOnceOps
92.  def scanRight[B](z: B)(op: (A, B) => B): View[B]

    Produces a collection containing cumulative results of applying the operator going right to left.

    Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Example:

        List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)

    B

      the type of the elements in the resulting collection

    z

      the initial value

    op

      the binary operator applied to the intermediate result and the element

    returns

      collection with intermediate results

    Definition Classes
      IterableOps
93.  def size: Int

    The size of this view.

    The size of this view.

    Note: will not terminate for infinite-sized collections.

    returns

      the number of elements in this view.

    Definition Classes
      IterableOnceOps
94.  def sizeCompare(that: Iterable[_]): Int

    Compares the size of this view to the size of another `Iterable`.

    Compares the size of this view to the size of another `Iterable`.

    that

      the `Iterable` whose size is compared with this view's size.

    returns

      A value `x` where

          x <  0       if this.size <  that.size
          x == 0       if this.size == that.size
          x >  0       if this.size >  that.size

      The method as implemented here does not call `size` directly; its running time is `O(this.size min that.size)` instead of `O(this.size + that.size)`. The method should be overridden if computing `size` is cheap and `knownSize` returns `-1`.

    Definition Classes
      IterableOps
95.  def sizeCompare(otherSize: Int): Int

    Compares the size of this view to a test value.

    Compares the size of this view to a test value.

    otherSize

      the test value that gets compared with the size.

    returns

      A value `x` where

          x <  0       if this.size <  otherSize
          x == 0       if this.size == otherSize
          x >  0       if this.size >  otherSize

      The method as implemented here does not call `size` directly; its running time is `O(size min otherSize)` instead of `O(size)`. The method should be overridden if computing `size` is cheap and `knownSize` returns `-1`.

    Definition Classes
      IterableOps
    See also

      sizeIs

96.  final def sizeIs: SizeCompareOps

    Returns a value class containing operations for comparing the size of this view to a test value.

    Returns a value class containing operations for comparing the size of this view to a test value.

    These operations are implemented in terms of `sizeCompare(Int)`, and allow the following more readable usages:

        this.sizeIs < size     // this.sizeCompare(size) < 0
        this.sizeIs <= size    // this.sizeCompare(size) <= 0
        this.sizeIs == size    // this.sizeCompare(size) == 0
        this.sizeIs != size    // this.sizeCompare(size) != 0
        this.sizeIs >= size    // this.sizeCompare(size) >= 0
        this.sizeIs > size     // this.sizeCompare(size) > 0

    Definition Classes
      IterableOps
    Annotations
      @inline()
97.  def slice(from: Int, until: Int): View[A]

    Selects an interval of elements.

    Selects an interval of elements. The returned view is made up of all elements `x` which satisfy the invariant:

        from <= indexOf(x) < until

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    from

      the lowest index to include from this view.

    until

      the lowest index to EXCLUDE from this view.

    returns

      a view containing the elements greater than or equal to index `from` extending up to (but not including) index `until` of this view.

    Definition Classes
      IterableOps → IterableOnceOps
    Example:

    1. `List('a', 'b', 'c', 'd', 'e').slice(1, 3) == List('b', 'c')`

98.  def sliding(size: Int, step: Int): Iterator[View[A]]

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in `grouped`).

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in `grouped`).

    The returned iterator will be empty when called on an empty collection. The last element the iterator produces may be smaller than the window size when the original collection isn't exhausted by the window before it and its last element isn't skipped by the step before it.

    size

      the number of elements per group

    step

      the distance between the first elements of successive groups

    returns

      An iterator producing views of size `size`, except the last element (which may be the only element) will be smaller if there are fewer than `size` elements remaining to be grouped.

    Definition Classes
      IterableOps
    Examples:

    1. `List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))`

    ,

    2. `List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))`

    See also

      scala.collection.Iterator, method `sliding`

99.  def sliding(size: Int): Iterator[View[A]]

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in `grouped`).

    Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in `grouped`).

    An empty collection returns an empty iterator, and a non-empty collection containing fewer elements than the window size returns an iterator that will produce the original collection as its only element.

    size

      the number of elements per group

    returns

      An iterator producing views of size `size`, except for a non-empty collection with less than `size` elements, which returns an iterator that produces the source collection itself as its only element.

    Definition Classes
      IterableOps
    Examples:

    1. `List().sliding(2) = empty iterator`

    ,

    2. `List(1).sliding(2) = Iterator(List(1))`

    ,

    3. `List(1, 2).sliding(2) = Iterator(List(1, 2))`

    ,

    4. `List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))`

    See also

      scala.collection.Iterator, method `sliding`

100.  def span(p: (A) => Boolean): (View[A], View[A])

     Splits this view into a prefix/suffix pair according to a predicate.

     Splits this view into a prefix/suffix pair according to a predicate.

     Note: `c span p` is equivalent to (but possibly more efficient than) `(c takeWhile p, c dropWhile p)`, provided the evaluation of the predicate `p` does not cause any side effects.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     p

       the test predicate

     returns

       a pair consisting of the longest prefix of this view whose elements all satisfy `p`, and the rest of this view.

     Definition Classes
       IterableOps → IterableOnceOps
101.  def splitAt(n: Int): (View[A], View[A])

     Splits this view into a prefix/suffix pair at a given position.

     Splits this view into a prefix/suffix pair at a given position.

     Note: `c splitAt n` is equivalent to (but possibly more efficient than) `(c take n, c drop n)`.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       the position at which to split.

     returns

       a pair of views consisting of the first `n` elements of this view, and the other elements.

     Definition Classes
       IterableOps → IterableOnceOps
102.  def stepper[S <: Stepper[_]](implicit shape: StepperShape[A, S]): S

     Returns a scala.collection.Stepper for the elements of this collection.

     Returns a scala.collection.Stepper for the elements of this collection.

     The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.

     The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.

     - For collections of `Int`, `Short`, `Byte` or `Char`, an scala.collection.IntStepper is returned
     - For collections of `Double` or `Float`, a scala.collection.DoubleStepper is returned
     - For collections of `Long` a scala.collection.LongStepper is returned
     - For any other element type, an scala.collection.AnyStepper is returned

     Note that this method is overridden in subclasses and the return type is refined to `S with EfficientSplit`, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.

     Definition Classes
       IterableOnce
103.  def stringPrefix: String
     Attributes
       protected[this]
     Definition Classes
       View → Iterable
     Annotations
       @nowarn()
104.  def sum[B >: A](implicit num: math.Numeric[B]): B

     Sums the elements of this collection.

     Sums the elements of this collection.

     The default implementation uses `reduce` for a known non-empty collection, `foldLeft` otherwise.

     Note: will not terminate for infinite-sized collections.

     B

       the result type of the `+` operator.

     num

       an implicit parameter defining a set of numeric operations which includes the `+` operator to be used in forming the sum.

     returns

       the sum of all elements of this view with respect to the `+` operator in `num`.

     Definition Classes
       IterableOnceOps
105.  final def synchronized[T0](arg0: => T0): T0

     Executes the code in `body` with an exclusive lock on `this`.

     Executes the code in `body` with an exclusive lock on `this`.

     returns

       the result of `body`

     Definition Classes
       AnyRef
106.  def tail: View[A]

     The rest of the collection without its first element.

     The rest of the collection without its first element.

     Definition Classes
       IterableOps
107.  def tails: Iterator[View[A]]

     Iterates over the tails of this view.

     Iterates over the tails of this view. The first value will be this view and the final one will be an empty view, with the intervening values the results of successive applications of `tail`.

     returns

       an iterator over all the tails of this view

     Definition Classes
       IterableOps
     Example:

     1. `List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)`

108.  def take(n: Int): View[A]

     Selects the first `n` elements.

     Selects the first `n` elements.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       the number of elements to take from this view.

     returns

       a view consisting only of the first `n` elements of this view, or else the whole view, if it has less than `n` elements. If `n` is negative, returns an empty view.

     Definition Classes
       IterableOps → IterableOnceOps
109.  def takeRight(n: Int): View[A]

     Selects the last n elements.

     Selects the last n elements.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       the number of elements to take from this view.

     returns

       a view consisting only of the last `n` elements of this view, or else the whole view, if it has less than `n` elements. If `n` is negative, returns an empty view.

     Definition Classes
       IterableOps
110.  def takeWhile(p: (A) => Boolean): View[A]

     Takes longest prefix of elements that satisfy a predicate.

     Takes longest prefix of elements that satisfy a predicate.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     p

       The predicate used to test elements.

     returns

       the longest prefix of this view whose elements all satisfy the predicate `p`.

     Definition Classes
       IterableOps → IterableOnceOps
111.  def tapEach[U](f: (A) => U): View[A]

     Applies a side-effecting function to each element in this collection.

     Applies a side-effecting function to each element in this collection. Strict collections will apply `f` to their elements immediately, while lazy collections like Views and LazyLists will only apply `f` on each element if and when that element is evaluated, and each time that element is evaluated.

     U

       the return type of f

     f

       a function to apply to each element in this view

     returns

       The same logical collection as this

     Definition Classes
       IterableOps → IterableOnceOps
112.  def to[C1](factory: Factory[A, C1]): C1

     Given a collection factory `factory`, converts this view to the appropriate representation for the current element type `A`.

     Given a collection factory `factory`, converts this view to the appropriate representation for the current element type `A`. Example uses:

         xs.to(List)
         xs.to(ArrayBuffer)
         xs.to(BitSet) // for xs: Iterable[Int]

     Definition Classes
       IterableOnceOps
113.  def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

     Converts this view to an `Array`.

     Converts this view to an `Array`.

     Implementation note: DO NOT call Array.from from this method.

     B

       The type of elements of the result, a supertype of `A`.

     returns

       This view as an `Array[B]`.

     Definition Classes
       IterableOnceOps
114.  final def toBuffer[B >: A]: Buffer[B]

     Converts this view to a `Buffer`.

     Converts this view to a `Buffer`.

     B

       The type of elements of the result, a supertype of `A`.

     returns

       This view as a `Buffer[B]`.

     Definition Classes
       IterableOnceOps
     Annotations
       @inline()
115.  def toIndexedSeq: immutable.IndexedSeq[A]

     Converts this view to an `IndexedSeq`.

     Converts this view to an `IndexedSeq`.

     returns

       This view as an `IndexedSeq[A]`.

     Definition Classes
       IterableOnceOps
116.  def toList: immutable.List[A]

     Converts this view to a `List`.

     Converts this view to a `List`.

     returns

       This view as a `List[A]`.

     Definition Classes
       IterableOnceOps
117.  def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]

     Converts this view to a `Map`, given an implicit coercion from the view's type to a key-value tuple.

     Converts this view to a `Map`, given an implicit coercion from the view's type to a key-value tuple.

     K

       The key type for the resulting map.

     V

       The value type for the resulting map.

     ev

       An implicit coercion from `A` to `[K, V]`.

     returns

       This view as a `Map[K, V]`.

     Definition Classes
       IterableOnceOps
118.  def toSeq: immutable.Seq[A]

     returns

       This view as a `Seq[A]`. This is equivalent to `to(Seq)` but might be faster.

     Definition Classes
       IterableOnceOps
119.  def toSet[B >: A]: immutable.Set[B]

     Converts this view to a `Set`.

     Converts this view to a `Set`.

     B

       The type of elements of the result, a supertype of `A`.

     returns

       This view as a `Set[B]`.

     Definition Classes
       IterableOnceOps
120.  def toString(): String

     Converts this view to a string.

     Converts this view to a string.

     returns

       a string representation of this collection. By default this string consists of the `className` of this view, followed by all elements separated by commas and enclosed in parentheses.

     Definition Classes
       View → Iterable → AnyRef → Any
121.  def toVector: immutable.Vector[A]

     Converts this view to a `Vector`.

     Converts this view to a `Vector`.

     returns

       This view as a `Vector[A]`.

     Definition Classes
       IterableOnceOps
122.  def transpose[B](implicit asIterable: (A) => Iterable[B]): View[View[B]]

     Transposes this view of iterable collections into a view of views.

     Transposes this view of iterable collections into a view of views.

     The resulting collection's type will be guided by the static type of view. For example:

         val xs = List(
                    Set(1, 2, 3),
                    Set(4, 5, 6)).transpose
         // xs == List(
         //         List(1, 4),
         //         List(2, 5),
         //         List(3, 6))

         val ys = Vector(
                    List(1, 2, 3),
                    List(4, 5, 6)).transpose
         // ys == Vector(
         //         Vector(1, 4),
         //         Vector(2, 5),
         //         Vector(3, 6))

     Note: Even when applied to a view or a lazy collection it will always force the elements.

     B

       the type of the elements of each iterable collection.

     asIterable

       an implicit conversion which asserts that the element type of this view is an `Iterable`.

     returns

       a two-dimensional view of views which has as nth row the nth column of this view.

     Definition Classes
       IterableOps
     Exceptions thrown

       `IllegalArgumentException` if all collections in this view are not of the same size.

123.  def unzip[A1, A2](implicit asPair: (A) => (A1, A2)): (View[A1], View[A2])

     Converts this view of pairs into two collections of the first and second half of each pair.

     Converts this view of pairs into two collections of the first and second half of each pair.

         val xs = `View`(
                    (1, "one"),
                    (2, "two"),
                    (3, "three")).unzip
         // xs == (`View`(1, 2, 3),
         //        `View`(one, two, three))

     A1

       the type of the first half of the element pairs

     A2

       the type of the second half of the element pairs

     asPair

       an implicit conversion which asserts that the element type of this view is a pair.

     returns

       a pair of views, containing the first, respectively second half of each element pair of this view.

     Definition Classes
       IterableOps
124.  def unzip3[A1, A2, A3](implicit asTriple: (A) => (A1, A2, A3)): (View[A1], View[A2], View[A3])

     Converts this view of triples into three collections of the first, second, and third element of each triple.

     Converts this view of triples into three collections of the first, second, and third element of each triple.

         val xs = `View`(
                    (1, "one", '1'),
                    (2, "two", '2'),
                    (3, "three", '3')).unzip3
         // xs == (`View`(1, 2, 3),
         //        `View`(one, two, three),
         //        `View`(1, 2, 3))

     A1

       the type of the first member of the element triples

     A2

       the type of the second member of the element triples

     A3

       the type of the third member of the element triples

     asTriple

       an implicit conversion which asserts that the element type of this view is a triple.

     returns

       a triple of views, containing the first, second, respectively third member of each element triple of this view.

     Definition Classes
       IterableOps
125.  def view: View[A]

     A view over the elements of this collection.

     A view over the elements of this collection.

     Definition Classes
       View → IterableOps
126.  final def wait(): Unit

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
     Note

       not specified by SLS as a member of AnyRef

127.  final def wait(arg0: Long, arg1: Int): Unit

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException])
     Note

       not specified by SLS as a member of AnyRef

128.  final def wait(arg0: Long): Unit

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

     See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

     Definition Classes
       AnyRef
     Annotations
       @throws(classOf[java.lang.InterruptedException]) @native()
     Note

       not specified by SLS as a member of AnyRef

129.  def withFilter(p: (A) => Boolean): WithFilter[A, [_]View[_]]

     Creates a non-strict filter of this view.

     Creates a non-strict filter of this view.

     Note: the difference between `c filter p` and `c withFilter p` is that the former creates a new collection, whereas the latter only restricts the domain of subsequent `map`, `flatMap`, `foreach`, and `withFilter` operations.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     p

       the predicate used to test elements.

     returns

       an object of class `WithFilter`, which supports `map`, `flatMap`, `foreach`, and `withFilter` operations. All these operations apply to those elements of this view which satisfy the predicate `p`.

     Definition Classes
       IterableOps
130.  def zip[B](that: IterableOnce[B]): View[(A, B)]

     Returns a view formed from this view and another iterable collection by combining corresponding elements in pairs.

     Returns a view formed from this view and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

     B

       the type of the second half of the returned pairs

     that

       The iterable providing the second half of each result pair

     returns

       a new view containing pairs consisting of corresponding elements of this view and `that`. The length of the returned collection is the minimum of the lengths of this view and `that`.

     Definition Classes
       IterableOps
131.  def zipAll[A1 >: A, B](that: Iterable[B], thisElem: A1, thatElem: B): View[(A1, B)]

     Returns a view formed from this view and another iterable collection by combining corresponding elements in pairs.

     Returns a view formed from this view and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

     that

       the iterable providing the second half of each result pair

     thisElem

       the element to be used to fill up the result if this view is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this view.

     returns

       a new view containing pairs consisting of corresponding elements of this view and `that`. The length of the returned collection is the maximum of the lengths of this view and `that`. If this view is shorter than `that`, `thisElem` values are used to pad the result. If `that` is shorter than this view, `thatElem` values are used to pad the result.

     Definition Classes
       IterableOps
132.  def zipWithIndex: View[(A, Int)]

     Zips this view with its indices.

     Zips this view with its indices.

     returns

       A new view containing pairs consisting of all elements of this view paired with their index. Indices start at `0`.

     Definition Classes
       IterableOps → IterableOnceOps
     Example:

     1. `List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))`

### Deprecated Value Members

1.  def ++:[B >: A](that: IterableOnce[B]): View[B]
   Definition Classes
     IterableOps
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable

2.  def /:[B](z: B)(op: (B, A) => B): B
   Implicit
     This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   Shadowing
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         (abstractView: IterableOnceExtensionMethods[A])./:(z)(op)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use .iterator.foldLeft instead

3.  final def /:[B](z: B)(op: (B, A) => B): B
   Definition Classes
     IterableOnceOps
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use foldLeft instead of /:

4.  def :\[B](z: B)(op: (A, B) => B): B
   Implicit
     This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   Shadowing
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         (abstractView: IterableOnceExtensionMethods[A]).:\(z)(op)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use .iterator.foldRight instead

5.  final def :\[B](z: B)(op: (A, B) => B): B
   Definition Classes
     IterableOnceOps
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use foldRight instead of :\

6.  def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B

   Aggregates the results of applying an operator to subsequent elements.

   Aggregates the results of applying an operator to subsequent elements.

   Since this method degenerates to `foldLeft` for sequential (non-parallel) collections, where the combining operation is ignored, it is advisable to prefer `foldLeft` for that case.

   For parallel collections, use the `aggregate` method specified by `scala.collection.parallel.ParIterableLike`.

   B

     the result type, produced by `seqop`, `combop`, and by this function as a final result.

   z

     the start value, a neutral element for `seqop`.

   seqop

     the binary operator used to accumulate the result.

   combop

     an associative operator for combining sequential results, unused for sequential collections.

   Definition Classes
     IterableOnceOps
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) For sequential collections, prefer `foldLeft(z)(seqop)`. For parallel collections, use `ParIterableLike#aggregate`.

7.  def collectFirst[B](f: PartialFunction[A, B]): Option[B]
   Implicit
     This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   Shadowing
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         (abstractView: IterableOnceExtensionMethods[A]).collectFirst(f)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use .iterator.collectFirst(...) instead

8.  def companion: IterableFactory[[_]View[_]]
   Definition Classes
     IterableOps
   Annotations
     @deprecated @deprecatedOverriding() @inline()
   Deprecated

     (Since version 2.13.0) Use iterableFactory instead

9.  def copyToBuffer(dest: Buffer[A]): Unit
   Implicit
     This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   Shadowing
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         (abstractView: IterableOnceExtensionMethods[A]).copyToBuffer(dest)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use .iterator.copyToBuffer(...) instead

10.  final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use `dest ++= coll` instead

11.  def count(f: (A) => Boolean): Int
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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          (abstractView: IterableOnceExtensionMethods[A]).count(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.count(...) instead

12.  def exists(f: (A) => Boolean): Boolean
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).exists(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.exists(...) instead

13.  def filter(f: (A) => Boolean): Iterator[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
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          (abstractView: IterableOnceExtensionMethods[A]).filter(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.filter(...) instead

14.  def find(p: (A) => Boolean): Option[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).find(p)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.find instead

15.  def flatMap[B](f: (A) => IterableOnce[B]): IterableOnce[B]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).flatMap(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable

16.  def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).fold(z)(op)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.fold instead

17.  def foldLeft[B](z: B)(op: (B, A) => B): B
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).foldLeft(z)(op)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.foldLeft instead

18.  def foldRight[B](z: B)(op: (A, B) => B): B
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).foldRight(z)(op)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.foldRight instead

19.  def forall(f: (A) => Boolean): Boolean
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).forall(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.forall(...) instead

20.  def force: IndexedSeq[A]
    Definition Classes
      View
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Views no longer know about their underlying collection type; .force always returns an IndexedSeq

21.  def foreach[U](f: (A) => U): Unit
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).foreach(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.foreach(...) instead

22.  def formatted(fmtstr: String): String

    Returns string formatted according to given `format` string.

    Returns string formatted according to given `format` string. Format strings are as for `String.format` (@see java.lang.String.format).

    Implicit
      This member is added by an implicit conversion from AbstractView[A] toStringFormat[AbstractView[A]] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.12.16) Use `formatString.format(value)` instead of `value.formatted(formatString)`, or use the `f""` string interpolator. In Java 15 and later, `formatted` resolves to the new method in String which has reversed parameters.

23.  def hasDefiniteSize: Boolean

    Tests whether this view is known to have a finite size.

    Tests whether this view is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as `Stream`, the predicate returns `true` if all elements have been computed. It returns `false` if the stream is not yet evaluated to the end. Non-empty Iterators usually return `false` even if they were created from a collection with a known finite size.

    Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that `hasDefiniteSize` returns `true`. However, checking `hasDefiniteSize` can provide an assurance that size is well-defined and non-termination is not a concern.

    returns

      `true` if this collection is known to have finite size, `false` otherwise.

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)

    See also

      method `knownSize` for a more useful alternative

24.  def isEmpty: Boolean
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).isEmpty

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.isEmpty instead

25.  def map[B](f: (A) => B): IterableOnce[B]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).map(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.map instead or consider requiring an Iterable

26.  def max(implicit ord: math.Ordering[A]): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).max(ord)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.max instead

27.  def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).maxBy(f)(cmp)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.maxBy(...) instead

28.  def min(implicit ord: math.Ordering[A]): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).min(ord)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.min instead

29.  def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).minBy(f)(cmp)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.minBy(...) instead

30.  def mkString: String
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).mkString

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.mkString instead

31.  def mkString(sep: String): String
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).mkString(sep)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.mkString instead

32.  def mkString(start: String, sep: String, end: String): String
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).mkString(start, sep, end)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.mkString instead

33.  def nonEmpty: Boolean
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).nonEmpty

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.nonEmpty instead

34.  def product(implicit num: math.Numeric[A]): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).product(num)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.product instead

35.  def reduce(f: (A, A) => A): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).reduce(f)

    Definition Classes
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    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.reduce(...) instead

36.  def reduceLeft(f: (A, A) => A): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).reduceLeft(f)

    Definition Classes
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    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.reduceLeft(...) instead

37.  def reduceLeftOption(f: (A, A) => A): Option[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).reduceLeftOption(f)

    Definition Classes
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    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.reduceLeftOption(...) instead

38.  def reduceOption(f: (A, A) => A): Option[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).reduceOption(f)

    Definition Classes
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    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.reduceOption(...) instead

39.  def reduceRight(f: (A, A) => A): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (abstractView: IterableOnceExtensionMethods[A]).reduceRight(f)

    Definition Classes
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      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.reduceRight(...) instead

40.  def reduceRightOption(f: (A, A) => A): Option[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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      This implicitly inherited member is shadowed by one or more members in this class.
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          (abstractView: IterableOnceExtensionMethods[A]).reduceRightOption(f)

    Definition Classes
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      (Since version 2.13.0) Use .iterator.reduceRightOption(...) instead

41.  final def repr: View[A]
    Definition Classes
      IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

42.  def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.sameElements instead

43.  def seq: AbstractView.this.type
    Definition Classes
      Iterable
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Iterable.seq always returns the iterable itself

44.  def size: Int
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).size

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.size instead

45.  def sum(implicit num: math.Numeric[A]): A
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).sum(num)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.sum instead

46.  def to[C1](factory: Factory[A, C1]): C1
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).to(factory)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.to(factory) instead

47.  def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toArray(arg0)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.toArray

48.  def toBuffer[B >: A]: Buffer[B]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toBuffer

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.to(ArrayBuffer) instead

49.  def toIndexedSeq: IndexedSeq[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toIndexedSeq

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.toIndexedSeq instead

50.  final def toIterable: Iterable[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toIterable

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Iterable) instead

51.  final def toIterable: AbstractView.this.type

    returns

      This collection as an `Iterable[A]`. No new collection will be built if `this` is already an `Iterable[A]`.

    Definition Classes
      Iterable → IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.7) toIterable is internal and will be made protected; its name is similar to `toList` or `toSeq`, but it doesn't copy non-immutable collections

52.  def toIterator: Iterator[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toIterator

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator instead

53.  final def toIterator: Iterator[A]
    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator instead of .toIterator

54.  def toList: immutable.List[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toList

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.to(List) instead

55.  def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toMap(ev)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Map) instead

56.  def toSeq: immutable.Seq[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toSeq

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Seq) instead

57.  def toSet[B >: A]: immutable.Set[B]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toSet

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Set) instead

58.  def toStream: immutable.Stream[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toStream

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(LazyList) instead

59.  final def toStream: immutable.Stream[A]
    Definition Classes
      IterableOnceOps
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .to(LazyList) instead of .toStream

60.  final def toTraversable: Traversable[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toTraversable

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Iterable) instead

61.  final def toTraversable: Traversable[A]

    Converts this view to an unspecified Iterable.

    Converts this view to an unspecified Iterable. Will return the same collection if this instance is already Iterable.

    returns

      An Iterable containing all elements of this view.

    Definition Classes
      IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) toTraversable is internal and will be made protected; its name is similar to `toList` or `toSeq`, but it doesn't copy non-immutable collections

62.  def toVector: immutable.Vector[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).toVector

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.to(Vector) instead

63.  def view(from: Int, until: Int): View[A]

    A view over a slice of the elements of this collection.

    A view over a slice of the elements of this collection.

    Definition Classes
      IterableOps
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)

64.  def withFilter(f: (A) => Boolean): Iterator[A]
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
      This implicitly inherited member is shadowed by one or more members in this class.
      To access this member you can use a type ascription:

          (abstractView: IterableOnceExtensionMethods[A]).withFilter(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.withFilter(...) instead

65.  def →[B](y: B): (AbstractView[A], B)
    Implicit
      This member is added by an implicit conversion from AbstractView[A] toArrowAssoc[AbstractView[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use `->` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

### Inherited from View[A]

### Inherited from java.io.Serializable

### Inherited from AbstractIterable[A]

### Inherited from Iterable[A]

### Inherited from IterableFactoryDefaults[A, [x]View[x]]

### Inherited from IterableOps[A, [_]View[_], View[A]]

### Inherited from IterableOnceOps[A, [_]View[_], View[A]]

### Inherited from IterableOnce[A]

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion iterableOnceExtensionMethods fromAbstractView[A] to IterableOnceExtensionMethods[A]

### Inherited by implicit conversion any2stringadd fromAbstractView[A] to any2stringadd[AbstractView[A]]

### Inherited by implicit conversion StringFormat fromAbstractView[A] to StringFormat[AbstractView[A]]

### Inherited by implicit conversion Ensuring fromAbstractView[A] to Ensuring[AbstractView[A]]

### Inherited by implicit conversion ArrowAssoc fromAbstractView[A] to ArrowAssoc[AbstractView[A]]

### Ungrouped