Scala Standard Library2.13.17 < 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

t

scala.collection

# Iterator

###
Companion object Iterator

#### trait Iterator[+A] extends IterableOnce[A] with IterableOnceOps[A, Iterator, Iterator[A]]

Iterators are data structures that allow to iterate over a sequence of elements. They have a `hasNext` method for checking if there is a next element available, and a `next` method which returns the next element and advances the iterator.

An iterator is mutable: most operations on it change its state. While it is often used to iterate through the elements of a collection, it can also be used without being backed by any collection (see constructors on the companion object).

It is of particular importance to note that, unless stated otherwise, one should never use an iterator after calling a method on it. The two most important exceptions are also the sole abstract methods: `next` and `hasNext`.

Both these methods can be called any number of times without having to discard the iterator. Note that even `hasNext` may cause mutation -- such as when iterating from an input stream, where it will block until the stream is closed or some input becomes available.

Consider this example for safe and unsafe use:

    def f[A](it: Iterator[A]) = {
      if (it.hasNext) {            // Safe to reuse "it" after "hasNext"
        it.next()                  // Safe to reuse "it" after "next"
        val remainder = it.drop(2) // it is *not* safe to use "it" again after this line!
        remainder.take(2)          // it is *not* safe to use "remainder" after this line!
      } else it
    }

Self Type
  Iterator[A]
Source
  Iterator.scala

Linear Supertypes
IterableOnceOps[A, Iterator, Iterator[A]], IterableOnce[A], AnyRef, Any
Known Subclasses
AbstractIterator, BufferedIterator, GroupedIterator, BufferedSource, BufferedLineIterator, Source, LineIterator, MatchIterator
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. Iterator
2. IterableOnceOps
3. IterableOnce
4. AnyRef
5. 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

### Type Members

1.  class GroupedIterator[B >: A] extends AbstractIterator[immutable.Seq[B]]

   A flexible iterator for transforming an `Iterator[A]` into an `Iterator[Seq[A]]`, with configurable sequence size, step, and strategy for dealing with remainder elements which don't fit evenly into the last group.

   A flexible iterator for transforming an `Iterator[A]` into an `Iterator[Seq[A]]`, with configurable sequence size, step, and strategy for dealing with remainder elements which don't fit evenly into the last group.

   A `GroupedIterator` is yielded by `grouped` and by `sliding`, where the `step` may differ from the group `size`.

### Abstract Value Members

1.  abstract def hasNext: Boolean

   Check if there is a next element available.

   Check if there is a next element available.

   returns

     `true` if there is a next element, `false` otherwise

   Note

     Reuse: The iterator remains valid for further use whatever result is returned.

2.  abstract def next(): A

   Return the next element and advance the iterator.

   Return the next element and advance the iterator.

   returns

     the next element.

   Annotations
     @throws(cause = "")
   Exceptions thrown

     `NoSuchElementException` if there is no next element.

   Note

     Reuse: Advances the iterator, which may exhaust the elements. It is valid to make additional calls on the iterator.

### 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 Iterator[A] toany2stringadd[Iterator[A]] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  final def ++[B >: A](xs: => IterableOnce[B]): Iterator[B]
   Annotations
     @inline()
5.  def ->[B](y: B): (Iterator[A], B)
   Implicit
     This member is added by an implicit conversion from Iterator[A] toArrowAssoc[Iterator[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 iterator to a string builder.

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

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

   Appends all elements of this iterator 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 iterator 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 buffered: BufferedIterator[A]

    Creates a buffered iterator from this iterator.

    Creates a buffered iterator from this iterator.

    returns

      a buffered iterator producing the same values as this iterator.

    Note

      Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

    See also

      scala.collection.BufferedIterator

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.  def collect[B](pf: PartialFunction[A, B]): Iterator[B]

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

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

    B

      the element type of the returned iterator.

    pf

      the partial function which filters and maps the iterator.

    returns

      a new iterator 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
      Iterator → IterableOnceOps
14.  def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

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

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

    Note: may not terminate for infinite iterators.

    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)`

15.  def concat[B >: A](xs: => IterableOnce[B]): Iterator[B]
16.  def contains(elem: Any): Boolean

    Tests whether this iterator contains a given value as an element.

    Tests whether this iterator contains a given value as an element.

    Note: may not terminate for infinite iterators.

    elem

      the element to test.

    returns

      `true` if this iterator produces some value that is is equal (as determined by `==`) to `elem`, `false` otherwise.

    Note

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

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 iterator.

    Copying will stop once either all the elements of this iterator 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 iterator.

    Copying will stop once either all the elements of this iterator 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 iterator.

    Copying will stop once either all the elements of this iterator 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 iterator which satisfy a predicate.

    Counts the number of elements in the iterator 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 distinct: Iterator[A]

    Builds a new iterator from this one without any duplicated elements on it.

    Builds a new iterator from this one without any duplicated elements on it.

    returns

      iterator with distinct elements

    Note

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

23.  def distinctBy[B](f: (A) => B): Iterator[A]

    Builds a new iterator from this one without any duplicated elements as determined by `==` after applying the transforming function `f`.

    Builds a new iterator from this one without any duplicated elements as determined by `==` after applying the transforming function `f`.

    B

      the type of the elements after being transformed by `f`

    f

      The transforming function whose result is used to determine the uniqueness of each element

    returns

      iterator with distinct elements

    Note

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

24.  def drop(n: Int): Iterator[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 iterator.

    returns

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

    Definition Classes
      Iterator → IterableOnceOps
25.  def dropWhile(p: (A) => Boolean): Iterator[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 iterator, 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 iterator.

    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 iterator whose first element does not satisfy the predicate `p`.

    Definition Classes
      Iterator → IterableOnceOps
26.  def duplicate: (Iterator[A], Iterator[A])

    Creates two new iterators that both iterate over the same elements as this iterator (in the same order).

    Creates two new iterators that both iterate over the same elements as this iterator (in the same order). The duplicate iterators are considered equal if they are positioned at the same element.

    Given that most methods on iterators will make the original iterator unfit for further use, this methods provides a reliable way of calling multiple such methods on an iterator.

    returns

      a pair of iterators

    Note

      The implementation may allocate temporary storage for elements iterated by one iterator but not yet by the other.

      ,

      Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.

27.  def ensuring(cond: (Iterator[A]) => Boolean, msg: => Any): Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[A] toEnsuring[Iterator[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
28.  def ensuring(cond: (Iterator[A]) => Boolean): Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[A] toEnsuring[Iterator[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
29.  def ensuring(cond: Boolean, msg: => Any): Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[A] toEnsuring[Iterator[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
30.  def ensuring(cond: Boolean): Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[A] toEnsuring[Iterator[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
31.  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
32.  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
33.  def exists(p: (A) => Boolean): Boolean

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

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

    Note: may not terminate for infinite iterators.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      IterableOnceOps
34.  def filter(p: (A) => Boolean): Iterator[A]

    Selects all elements of this iterator which satisfy a predicate.

    Selects all elements of this iterator which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      Iterator → IterableOnceOps
35.  def filterNot(p: (A) => Boolean): Iterator[A]

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

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

    returns

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

    Definition Classes
      Iterator → IterableOnceOps
36.  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

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

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

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

    Note: may not terminate for infinite iterators.

    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 iterator that satisfies `p`, or `None` if none exists.

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

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

    Builds a new iterator by applying a function to all elements of this iterator 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 iterator. 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 iterator resulting from applying the given collection-valued function `f` to each element of this iterator and concatenating the results.

    Definition Classes
      Iterator → IterableOnceOps
39.  def flatten[B](implicit ev: (A) => IterableOnce[B]): Iterator[B]

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

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

    The resulting collection's type will be guided by the type of iterator. 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.

    returns

      a new iterator resulting from concatenating all element collections.

    Definition Classes
      Iterator → IterableOnceOps
40.  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 iterator.

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

    For each application of the operator, each operand is either an element of this iterator, 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 iterator is empty.

    Definition Classes
      IterableOnceOps
41.  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 iterator, going left to right.

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

    "Going left to right" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this iterator, 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 iterator 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 iterator, going left to right. Returns `z` if this iterator is empty.

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

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

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

    "Going right to left" only makes sense if this collection is ordered: then if `x1`, `x2`, ..., `xn` are the elements of this iterator, 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 iterator 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 iterator and `z`, going right to left. Returns `z` if this iterator is empty.

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

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

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

    Note: may not terminate for infinite iterators.

    p

      the predicate used to test elements.

    returns

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

    Definition Classes
      IterableOnceOps
44.  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
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 grouped[B >: A](size: Int): GroupedIterator[B]

    Returns an iterator which groups this iterator into fixed size blocks.

    Returns an iterator which groups this iterator into fixed size blocks. Example usages:

        // Returns List(List(1, 2, 3), List(4, 5, 6), List(7)))
        (1 to 7).iterator.grouped(3).toList
        // Returns List(List(1, 2, 3), List(4, 5, 6))
        (1 to 7).iterator.grouped(3).withPartial(false).toList
        // Returns List(List(1, 2, 3), List(4, 5, 6), List(7, 20, 25)
        // Illustrating that withPadding's argument is by-name.
        val it2 = Iterator.iterate(20)(_ + 5)
        (1 to 7).iterator.grouped(3).withPadding(it2.next).toList

    Note

      Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

47.  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()
48.  def indexOf[B >: A](elem: B, from: Int): Int

    Returns the index of the first occurrence of the specified object in this iterable object after or at some start index.

    Returns the index of the first occurrence of the specified object in this iterable object after or at some start index.

    Note: may not terminate for infinite iterators.

    elem

      element to search for.

    from

      the start index

    returns

      the index `>= from` of the first occurrence of `elem` in the values produced by this iterator, or -1 if such an element does not exist until the end of the iterator is reached.

    Note

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

49.  def indexOf[B >: A](elem: B): Int

    Returns the index of the first occurrence of the specified object in this iterable object.

    Returns the index of the first occurrence of the specified object in this iterable object.

    Note: may not terminate for infinite iterators.

    elem

      element to search for.

    returns

      the index of the first occurrence of `elem` in the values produced by this iterator, or -1 if such an element does not exist until the end of the iterator is reached.

    Note

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

50.  def indexWhere(p: (A) => Boolean, from: Int = 0): Int

    Finds index of the first element satisfying some predicate after or at some start index.

    Finds index of the first element satisfying some predicate after or at some start index.

    Note: may not terminate for infinite iterators.

    p

      the predicate used to test elements.

    from

      the start index

    returns

      the index `>= from` of the first element of this iterator that satisfies the predicate `p`, or `-1`, if none exists.

    Note

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

51.  def isEmpty: Boolean

    Tests whether the iterator is empty.

    Tests whether the iterator 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 iterator contains no elements, `false` otherwise.

    Definition Classes
      Iterator → IterableOnceOps
    Annotations
      @deprecatedOverriding()
52.  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.

53.  def isTraversableAgain: Boolean

    Tests whether this iterator can be repeatedly traversed.

    Tests whether this iterator 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
      IterableOnceOps
54.  final def iterator: Iterator[A]

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

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

    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
      Iterator → IterableOnce
    Annotations
      @inline()
55.  def knownSize: Int

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

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

    Definition Classes
      IterableOnce
56.  final def length: Int
    Annotations
      @inline()
57.  def map[B](f: (A) => B): Iterator[B]

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

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

    B

      the element type of the returned iterator.

    f

      the function to apply to each element.

    returns

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

    Definition Classes
      Iterator → IterableOnceOps
58.  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 iterator with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

59.  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.

    returns

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

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

60.  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.

    returns

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

    Definition Classes
      IterableOnceOps
61.  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 iterator with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
62.  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 iterator with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

63.  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.

    returns

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

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

64.  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.

    returns

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

    Definition Classes
      IterableOnceOps
65.  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 iterator with respect to the ordering `ord`.

    Definition Classes
      IterableOnceOps
66.  final def mkString: String

    Displays all elements of this iterator in a string.

    Displays all elements of this iterator in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

    Delegates to addString, which can be overridden.

    sep

      the separator string.

    returns

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

    Definition Classes
      IterableOnceOps
    Annotations
      @inline()
    Example:

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

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

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

    Displays all elements of this iterator 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 iterator. 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 iterator are separated by the string `sep`.

    Definition Classes
      IterableOnceOps
    Example:

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

69.  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
70.  def nextOption(): Option[A]

    Wraps the value of `next()` in an option.

    Wraps the value of `next()` in an option.

    returns

      `Some(next)` if a next element exists, `None` otherwise.

71.  def nonEmpty: Boolean

    Tests whether the iterator is not empty.

    Tests whether the iterator is not empty.

    returns

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

    Definition Classes
      IterableOnceOps
    Annotations
      @deprecatedOverriding()
72.  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

73.  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

74.  def padTo[B >: A](len: Int, elem: B): Iterator[B]

    A copy of this iterator with an element value appended until a given target length is reached.

    A copy of this iterator with an element value appended until a given target length is reached.

    B

      the element type of the returned iterator.

    len

      the target length

    elem

      the padding value

    returns

      a new iterator consisting of all elements of this iterator followed by the minimal number of occurrences of `elem` so that the resulting collection has a length of at least `len`.

75.  def partition(p: (A) => Boolean): (Iterator[A], Iterator[A])

    Partitions this iterator in two iterators according to a predicate.

    Partitions this iterator in two iterators according to a predicate.

    p

      the predicate on which to partition

    returns

      a pair of iterators: the iterator that satisfies the predicate `p` and the iterator that does not. The relative order of the elements in the resulting iterators is the same as in the original iterator.

    Note

      Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.

76.  def patch[B >: A](from: Int, patchElems: Iterator[B], replaced: Int): Iterator[B]

    Returns this iterator with patched values.

    Returns this iterator with patched values. Patching at negative indices is the same as patching starting at 0. Patching at indices at or larger than the length of the original iterator appends the patch to the end. If more values are replaced than actually exist, the excess is ignored.

    from

      The start index from which to patch

    patchElems

      The iterator of patch values

    replaced

      The number of values in the original iterator that are replaced by the patch.

    Note

      Reuse: After calling this method, one should discard the iterator it was called on, as well as the one passed as a parameter, and use only the iterator that was returned. Using the old iterators is undefined, subject to change, and may result in changes to the new iterator as well.

77.  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 iterator with respect to the `*` operator in `num`.

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

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

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

    For each application of the operator, each operand is either an element of this iterator 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 iterator is nonempty.

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

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

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

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

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

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

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

    If this iterator 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 iterator 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 iterator with `op` going left to right if the iterator is nonempty, inside a `Some`, and `None` otherwise.

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

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

    If this iterator 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 iterator 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 iterator with `op` if the iterator is nonempty, inside a `Some`, and `None` otherwise.

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

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

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

    Definition Classes
      IterableOnceOps
    Exceptions thrown

      `UnsupportedOperationException` if this iterator is empty.

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

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

    If this iterator 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 iterator 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 iterator with `op` going right to left if the iterator is nonempty, inside a `Some`, and `None` otherwise.

    Definition Classes
      IterableOnceOps
84.  def reversed: Iterable[A]
    Attributes
      protected
    Definition Classes
      IterableOnceOps
85.  def sameElements[B >: A](that: IterableOnce[B]): Boolean

    Checks whether corresponding elements of the given iterable collection compare equal (with respect to `==`) to elements of this iterator.

    Checks whether corresponding elements of the given iterable collection compare equal (with respect to `==`) to elements of this iterator.

    B

      the type of the elements of collection `that`.

    that

      the collection to compare

    returns

      `true` if both collections contain equal elements in the same order, `false` otherwise.

86.  def scanLeft[B](z: B)(op: (B, A) => B): Iterator[B]

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

    Produces a iterator 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
      Iterator → IterableOnceOps
87.  def size: Int

    The size of this iterator.

    The size of this iterator.

    Note: will not terminate for infinite-sized collections.

    returns

      the number of elements in this iterator.

    Definition Classes
      IterableOnceOps
88.  def slice(from: Int, until: Int): Iterator[A]

    Selects an interval of elements.

    Selects an interval of elements. The returned iterator 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 iterator.

    until

      the lowest index to EXCLUDE from this iterator.

    returns

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

    Definition Classes
      Iterator → IterableOnceOps
    Example:

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

89.  def sliceIterator(from: Int, until: Int): Iterator[A]

    Creates an optionally bounded slice, unbounded if `until` is negative.

    Creates an optionally bounded slice, unbounded if `until` is negative.

    Attributes
      protected
90.  def sliding[B >: A](size: Int, step: Int = 1): GroupedIterator[B]

    Returns an iterator which presents a "sliding window" view of this iterator.

    Returns an iterator which presents a "sliding window" view of this iterator. The first argument is the window size, and the second argument `step` is how far to advance the window on each iteration. The `step` defaults to `1`.

    The returned `GroupedIterator` can be configured to either pad a partial result to size `size` or suppress the partial result entirely.

    Example usages:

        // Returns List(ArraySeq(1, 2, 3), ArraySeq(2, 3, 4), ArraySeq(3, 4, 5))
        (1 to 5).iterator.sliding(3).toList
        // Returns List(ArraySeq(1, 2, 3, 4), ArraySeq(4, 5))
        (1 to 5).iterator.sliding(4, 3).toList
        // Returns List(ArraySeq(1, 2, 3, 4))
        (1 to 5).iterator.sliding(4, 3).withPartial(false).toList
        // Returns List(ArraySeq(1, 2, 3, 4), ArraySeq(4, 5, 20, 25))
        // Illustrating that withPadding's argument is by-name.
        val it2 = Iterator.iterate(20)(_ + 5)
        (1 to 5).iterator.sliding(4, 3).withPadding(it2.next).toList

    size

      the number of elements per group

    step

      the distance between the first elements of successive groups

    returns

      A `GroupedIterator` producing `Seq[B]`s of size `size`, except the last element (which may be the only element) will be truncated if there are fewer than `size` elements remaining to be grouped. This behavior can be configured.

    Note

      Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

91.  def span(p: (A) => Boolean): (Iterator[A], Iterator[A])

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

    Splits this iterator 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 iterator whose elements all satisfy `p`, and the rest of this iterator.

    Definition Classes
      Iterator → IterableOnceOps
    Note

      Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.

92.  def splitAt(n: Int): (Iterator[A], Iterator[A])

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

    Splits this iterator 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 iterators consisting of the first `n` elements of this iterator, and the other elements.

    Definition Classes
      IterableOnceOps
93.  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
94.  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 iterator with respect to the `+` operator in `num`.

    Definition Classes
      IterableOnceOps
95.  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
96.  def take(n: Int): Iterator[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 iterator.

    returns

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

    Definition Classes
      Iterator → IterableOnceOps
97.  def takeWhile(p: (A) => Boolean): Iterator[A]

    Selects the longest prefix of elements that satisfy a predicate.

    Selects the longest prefix of elements that satisfy a predicate.

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

    Example:

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

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

    Use span to obtain both the prefix and suffix. Use filter to retain only those elements from the entire iterator 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 prefix of this iterator whose elements all satisfy the predicate `p`.

    Definition Classes
      Iterator → IterableOnceOps
98.  def tapEach[U](f: (A) => U): Iterator[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 iterator

    returns

      The same logical collection as this

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

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

    Given a collection factory `factory`, converts this iterator 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
100.  def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

     Converts this iterator to an `Array`.

     Converts this iterator 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 iterator as an `Array[B]`.

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

     Converts this iterator to a `Buffer`.

     Converts this iterator to a `Buffer`.

     B

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

     returns

       This iterator as a `Buffer[B]`.

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

     Converts this iterator to an `IndexedSeq`.

     Converts this iterator to an `IndexedSeq`.

     returns

       This iterator as an `IndexedSeq[A]`.

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

     Converts this iterator to a `List`.

     Converts this iterator to a `List`.

     returns

       This iterator as a `List[A]`.

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

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

     Converts this iterator to a `Map`, given an implicit coercion from the iterator'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 iterator as a `Map[K, V]`.

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

     returns

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

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

     Converts this iterator to a `Set`.

     Converts this iterator to a `Set`.

     B

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

     returns

       This iterator as a `Set[B]`.

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

     Converts this iterator to a string.

     Converts this iterator to a string.

     returns

       `"<iterator>"`

     Definition Classes
       Iterator → AnyRef → Any
     Note

       Reuse: The iterator remains valid for further use whatever result is returned.

108.  def toVector: immutable.Vector[A]

     Converts this iterator to a `Vector`.

     Converts this iterator to a `Vector`.

     returns

       This iterator as a `Vector[A]`.

     Definition Classes
       IterableOnceOps
109.  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

110.  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

111.  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

112.  def withFilter(p: (A) => Boolean): Iterator[A]

     Creates an iterator over all the elements of this iterator that satisfy the predicate `p`.

     Creates an iterator over all the elements of this iterator that satisfy the predicate `p`. The order of the elements is preserved.

     Note: `withFilter` is the same as `filter` on iterators. It exists so that for-expressions with filters work over iterators.

     p

       the predicate used to test values.

     returns

       an iterator which produces those values of this iterator which satisfy the predicate `p`.

     Note

       Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterator that was returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterator as well.

113.  def zip[B](that: IterableOnce[B]): Iterator[(A, B)]
114.  def zipAll[A1 >: A, B](that: IterableOnce[B], thisElem: A1, thatElem: B): Iterator[(A1, B)]
115.  def zipWithIndex: Iterator[(A, Int)]

     Zips this iterator with its indices.

     Zips this iterator with its indices.

     returns

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

     Definition Classes
       Iterator → IterableOnceOps
     Example:

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

### Deprecated Value Members

1.  def /:[B](z: B)(op: (B, A) => B): B
   Implicit
     This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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     To access this member you can use a type ascription:

         (iterator: IterableOnceExtensionMethods[A])./:(z)(op)

   Definition Classes
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   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use .iterator.foldLeft instead

2.  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 /:

3.  def :\[B](z: B)(op: (A, B) => B): B
   Implicit
     This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
   Shadowing
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     To access this member you can use a type ascription:

         (iterator: IterableOnceExtensionMethods[A]).:\(z)(op)

   Definition Classes
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   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.13.0) Use .iterator.foldRight instead

4.  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 :\

5.  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`.

6.  def collectFirst[B](f: PartialFunction[A, B]): Option[B]
   Implicit
     This member is added by an implicit conversion from Iterator[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:

         (iterator: IterableOnceExtensionMethods[A]).collectFirst(f)

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated
   Deprecated

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

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

   Definition Classes
     IterableOnceExtensionMethods
   Annotations
     @deprecated
   Deprecated

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

8.  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

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

   Definition Classes
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   Annotations
     @deprecated
   Deprecated

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

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

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

11.  def filter(f: (A) => Boolean): Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).filter(f)

    Definition Classes
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    Annotations
      @deprecated
    Deprecated

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

12.  def find(p: (A) => Boolean): Option[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).find(p)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.find instead

13.  def flatMap[B](f: (A) => IterableOnce[B]): IterableOnce[B]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).flatMap(f)

    Definition Classes
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    Annotations
      @deprecated
    Deprecated

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

14.  def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
    Implicit
      This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Definition Classes
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      (Since version 2.13.0) Use .iterator.fold instead

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

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.foldLeft instead

16.  def foldRight[B](z: B)(op: (A, B) => B): B
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).foldRight(z)(op)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator.foldRight instead

17.  def forall(f: (A) => Boolean): Boolean
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).forall(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

18.  def foreach[U](f: (A) => U): Unit
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).foreach(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

19.  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 Iterator[A] toStringFormat[Iterator[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.

20.  final def hasDefiniteSize: Boolean

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

    Tests whether this iterator 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
      Iterator → IterableOnceOps
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) hasDefiniteSize on Iterator is the same as isEmpty

    See also

      method `knownSize` for a more useful alternative

21.  def isEmpty: Boolean
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).isEmpty

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.isEmpty instead

22.  def map[B](f: (A) => B): IterableOnce[B]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).map(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

23.  def max(implicit ord: math.Ordering[A]): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).max(ord)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.max instead

24.  def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).maxBy(f)(cmp)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

25.  def min(implicit ord: math.Ordering[A]): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).min(ord)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.min instead

26.  def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).minBy(f)(cmp)

    Definition Classes
      IterableOnceExtensionMethods
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    Deprecated

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

27.  def mkString: String
    Implicit
      This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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          (iterator: IterableOnceExtensionMethods[A]).mkString

    Definition Classes
      IterableOnceExtensionMethods
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      (Since version 2.13.0) Use .iterator.mkString instead

28.  def mkString(sep: String): String
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).mkString(sep)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
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    Deprecated

      (Since version 2.13.0) Use .iterator.mkString instead

29.  def mkString(start: String, sep: String, end: String): String
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).mkString(start, sep, end)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
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    Deprecated

      (Since version 2.13.0) Use .iterator.mkString instead

30.  def nonEmpty: Boolean
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).nonEmpty

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.nonEmpty instead

31.  def product(implicit num: math.Numeric[A]): A
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).product(num)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.product instead

32.  def reduce(f: (A, A) => A): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).reduce(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

33.  def reduceLeft(f: (A, A) => A): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).reduceLeft(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

34.  def reduceLeftOption(f: (A, A) => A): Option[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).reduceLeftOption(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

35.  def reduceOption(f: (A, A) => A): Option[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).reduceOption(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

36.  def reduceRight(f: (A, A) => A): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).reduceRight(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

37.  def reduceRightOption(f: (A, A) => A): Option[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).reduceRightOption(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

38.  def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).sameElements(that)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.sameElements instead

39.  def scanRight[B](z: B)(op: (A, B) => B): Iterator[B]
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Call scanRight on an Iterable instead.

40.  def seq: Iterator.this.type
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Iterator.seq always returns the iterator itself

41.  def size: Int
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).size

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.size instead

42.  def sum(implicit num: math.Numeric[A]): A
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).sum(num)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.sum instead

43.  def to[C1](factory: Factory[A, C1]): C1
    Implicit
      This member is added by an implicit conversion from Iterator[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.
      To access this member you can use a type ascription:

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

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

44.  def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

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

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.toArray

45.  def toBuffer[B >: A]: Buffer[B]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).toBuffer

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

46.  def toIndexedSeq: IndexedSeq[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).toIndexedSeq

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

      (Since version 2.13.0) Use .iterator.toIndexedSeq instead

47.  final def toIterable: Iterable[A]
    Implicit
      This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

48.  def toIterator: Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).toIterator

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

      (Since version 2.13.0) Use .iterator instead

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

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

50.  def toList: immutable.List[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).toList

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

51.  def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

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

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

52.  def toSeq: immutable.Seq[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).toSeq

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

53.  def toSet[B >: A]: immutable.Set[B]
    Implicit
      This member is added by an implicit conversion from Iterator[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:

          (iterator: IterableOnceExtensionMethods[A]).toSet

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

54.  def toStream: immutable.Stream[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).toStream

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

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

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

56.  final def toTraversable: Traversable[A]
    Implicit
      This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

57.  def toVector: immutable.Vector[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).toVector

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated @inline()
    Deprecated

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

58.  def withFilter(f: (A) => Boolean): Iterator[A]
    Implicit
      This member is added by an implicit conversion from Iterator[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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          (iterator: IterableOnceExtensionMethods[A]).withFilter(f)

    Definition Classes
      IterableOnceExtensionMethods
    Annotations
      @deprecated
    Deprecated

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

59.  def →[B](y: B): (Iterator[A], B)
    Implicit
      This member is added by an implicit conversion from Iterator[A] toArrowAssoc[Iterator[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 IterableOnceOps[A, Iterator, Iterator[A]]

### Inherited from IterableOnce[A]

### Inherited from AnyRef

### Inherited from Any

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

### Inherited by implicit conversion any2stringadd fromIterator[A] to any2stringadd[Iterator[A]]

### Inherited by implicit conversion StringFormat fromIterator[A] to StringFormat[Iterator[A]]

### Inherited by implicit conversion Ensuring fromIterator[A] to Ensuring[Iterator[A]]

### Inherited by implicit conversion ArrowAssoc fromIterator[A] to ArrowAssoc[Iterator[A]]

### Ungrouped