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class Collect[+A, B] extends AbstractView[B]

A view that collects elements of the underlying collection.

Annotations
@SerialVersionUID()
Source
View.scala
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Inherited
  1. Collect
  2. AbstractView
  3. View
  4. Serializable
  5. AbstractIterable
  6. Iterable
  7. IterableFactoryDefaults
  8. IterableOps
  9. IterableOnceOps
  10. IterableOnce
  11. AnyRef
  12. Any
Implicitly
  1. by iterableOnceExtensionMethods
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new Collect(underlying: SomeIterableOps[A], pf: PartialFunction[A, B])

Value Members

  1. final def ++[B >: B](suffix: IterableOnce[B]): View[B]

    Alias for concat

    Alias for concat

    Definition Classes
    IterableOps
    Annotations
    @inline()
  2. final def addString(b: mutable.StringBuilder): b.type

    Appends all elements of this view to a string builder.

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

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> val h = a.addString(b)
    h: StringBuilder = 1234
    b

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

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

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

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

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b, ", ")
    res0: StringBuilder = 1, 2, 3, 4
    b

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

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

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

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

    Example:

    scala> val a = List(1,2,3,4)
    a: List[Int] = List(1, 2, 3, 4)
    
    scala> val b = new StringBuilder()
    b: StringBuilder =
    
    scala> a.addString(b , "List(" , ", " , ")")
    res5: StringBuilder = List(1, 2, 3, 4)
    b

    the string builder to which elements are appended.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

    Definition Classes
    IterableOnceOps
  5. def collect[B](pf: PartialFunction[B, B]): View[B]

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

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

    B

    the element type of the returned view.

    pf

    the partial function which filters and maps the view.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  6. def collectFirst[B](pf: PartialFunction[B, B]): Option[B]

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

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

    Note: may not terminate for infinite-sized collections.

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

    pf

    the partial function

    returns

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

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

  7. def concat[B >: B](suffix: IterableOnce[B]): View[B]

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

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

    B

    the element type of the returned collection.

    suffix

    the iterable to append.

    returns

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

    Definition Classes
    IterableOps
  8. def copyToArray[B >: B](xs: Array[B], start: Int, len: Int): Int

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

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

    Fills the given array xs starting at index start with at most len elements of this view.

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

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    len

    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.

  9. def copyToArray[B >: B](xs: 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 xs starting at index start with values of this view.

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

    B

    the type of the elements of the array.

    xs

    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.

  10. def copyToArray[B >: B](xs: 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 xs starting at index start with values of this view.

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

    B

    the type of the elements of the array.

    xs

    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.

  11. def corresponds[B](that: IterableOnce[B])(p: (B, 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
  12. def count(p: (B) => Boolean): Int

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

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

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    IterableOnceOps
  13. def drop(n: Int): View[B]

    Selects all elements except the first n ones.

    Selects all elements except the first n ones.

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

    n

    the number of elements to drop from this view.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  14. def dropRight(n: Int): View[B]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

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

    n

    the number of elements to drop from this view.

    returns

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

    Definition Classes
    IterableOps
  15. def dropWhile(p: (B) => Boolean): View[B]

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

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

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

    Example:

    scala> List(1, 2, 3, 100, 4).dropWhile(n => n < 10)
    val res0: List[Int] = List(100, 4)
    
    scala> List(1, 2, 3, 100, 4).dropWhile(n => n == 0)
    val res1: List[Int] = List(1, 2, 3, 100, 4)

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

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

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  16. def empty: View[B]

    The empty iterable of the same type as this iterable.

    The empty iterable of the same type as this iterable.

    returns

    an empty iterable of type C.

    Definition Classes
    ViewIterableFactoryDefaultsIterableOps
  17. def exists(p: (B) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOnceOps
  18. def filter(pred: (B) => Boolean): View[B]

    Selects all elements of this view which satisfy a predicate.

    Selects all elements of this view which satisfy a predicate.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  19. def filterNot(pred: (B) => Boolean): View[B]

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

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

    pred

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  20. def find(p: (B) => Boolean): Option[B]

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

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

    Note: may not terminate for infinite-sized collections.

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

    p

    the predicate used to test elements.

    returns

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

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

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

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

    For example:

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

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

    // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
    def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)
    
    // lettersOf will return a Set[Char], not a Seq
    def lettersOf(words: Seq[String]) = words.toSet flatMap ((word: String) => word.toSeq)
    
    // xs will be an Iterable[Int]
    val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)
    
    // ys will be a Map[Int, Int]
    val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)
    B

    the element type of the returned collection.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  22. def flatten[B](implicit asIterable: (B) => IterableOnce[B]): View[B]

    Converts this view of iterable collections into a view formed by the elements of these iterable collections.

    Converts this view of iterable collections into a view formed by the elements of these iterable collections.

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

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

    the type of the elements of each iterable collection.

    asIterable

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

    returns

    a new view resulting from concatenating all element views.

    Definition Classes
    IterableOpsIterableOnceOps
  23. def fold[A1 >: B](z: A1)(op: (A1, A1) => A1): A1

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

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

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

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

    op

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

    returns

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

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

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator.

    z

    An initial value.

    op

    A binary operator.

    returns

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

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

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the binary operator.

    z

    An initial value.

    op

    A binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  26. def forall(p: (B) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

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

    Definition Classes
    IterableOnceOps
  27. def foreach[U](f: (B) => 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
  28. def groupBy[K](f: (B) => K): immutable.Map[K, View[B]]

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

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

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

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

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

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

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

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

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

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

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

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

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

    K

    the type of keys returned by the discriminator function

    B

    the type of values returned by the transformation function

    key

    the discriminator function

    f

    the element transformation function

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

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

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

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

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

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

    Definition Classes
    IterableOps
  31. def grouped(size: Int): Iterator[View[B]]

    Partitions elements in fixed size views.

    Partitions elements in fixed size views.

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method grouped

  32. def head: B

    Selects the first element of this view.

    Selects the first element of this view.

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

    returns

    the first element of this view.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the view is empty.

  33. def headOption: Option[B]

    Optionally selects the first element.

    Optionally selects the first element.

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

    returns

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

    Definition Classes
    IterableOps
  34. def init: View[B]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

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

    Definition Classes
    IterableOps
  35. def inits: Iterator[View[B]]

    Iterates over the inits of this view.

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

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

    returns

    an iterator over all the inits of this view

    Definition Classes
    IterableOps
    Example:
    1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

  36. def isEmpty: Boolean

    Tests whether the view is empty.

    Tests whether the view is empty.

    Note: The default implementation creates and discards an iterator.

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

    returns

    true if the view contains no elements, false otherwise.

    Definition Classes
    IterableOnceOps
  37. def isTraversableAgain: Boolean

    Tests whether this view can be repeatedly traversed.

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

    returns

    true if it is repeatedly traversable, false otherwise.

    Definition Classes
    IterableOpsIterableOnceOps
  38. def iterableFactory: IterableFactory[View]

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

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

    Definition Classes
    ViewIterableIterableOps
    Note

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

  39. def iterator: Iterator[B]

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

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

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

    Definition Classes
    CollectIterableOnce
  40. def knownSize: Int

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

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

    Definition Classes
    IterableOnce
  41. def last: B

    Selects the last element.

    Selects the last element.

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

    returns

    The last element of this view.

    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the view is empty.

  42. def lastOption: Option[B]

    Optionally selects the last element.

    Optionally selects the last element.

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

    returns

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

    Definition Classes
    IterableOps
  43. def lazyZip[B](that: Iterable[B]): LazyZip2[B, B, Collect.this.type]

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

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

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

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

    the type of the second element in each eventual pair

    that

    the iterable providing the second element of each eventual pair

    returns

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

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

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

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

    B

    the element type of the returned view.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  45. def max[B >: B](implicit ord: math.Ordering[B]): B

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

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

    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 view with the largest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

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

    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 view with the largest value measured by function f with respect to the ordering cmp.

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

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

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

    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 view with the smallest value measured by function f with respect to the ordering cmp.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

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

    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 view with the smallest value measured by function f with respect to the ordering cmp.

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
  53. final def mkString: String

    Displays all elements of this view in a string.

    Displays all elements of this view in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

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

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

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

    Delegates to addString, which can be overridden.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

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

    Definition Classes
    IterableOnceOps
    Example:
    1. List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"

  56. def nonEmpty: Boolean

    Tests whether the view is not empty.

    Tests whether the view is not empty.

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecatedOverriding()
  57. def partition(p: (B) => Boolean): (View[B], View[B])

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

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

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

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

    Definition Classes
    IterableOps
  58. def partitionMap[A1, A2](f: (B) => Either[A1, A2]): (View[A1], View[A2])

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

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

    Example:

    val xs = `View`(1, "one", 2, "two", 3, "three") partitionMap {
     case i: Int => Left(i)
     case s: String => Right(s)
    }
    // xs == (`View`(1, 2, 3),
    //        `View`(one, two, three))
    A1

    the element type of the first resulting collection

    A2

    the element type of the second resulting collection

    f

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

    returns

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

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

    Multiplies together the elements of this collection.

    Multiplies together the elements of this collection.

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the * operator.

    num

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

    returns

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

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

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

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

    op

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

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  61. def reduceLeft[B >: B](op: (B, B) => B): B

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

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

    op

    A binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  62. def reduceLeftOption[B >: B](op: (B, B) => B): Option[B]

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

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

    op

    A binary operator.

    returns

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

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

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

    op

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

    returns

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

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

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

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

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

    op

    A binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this view is empty.

  65. def reduceRightOption[B >: B](op: (B, B) => B): Option[B]

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

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

    op

    A binary operator.

    returns

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

    Definition Classes
    IterableOnceOps
  66. def scan[B >: B](z: B)(op: (B, B) => B): View[B]

    Computes a prefix scan of the elements of the collection.

    Computes a prefix scan of the elements of the collection.

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

    B

    element type of the resulting collection

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOpsIterableOnceOps
  68. def scanRight[B](z: B)(op: (B, B) => B): View[B]

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

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

    Note: will not terminate for infinite-sized collections.

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

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

    Example:

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

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IterableOps
  69. def size: Int

    The size of this view.

    The size of this view.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this view.

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

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

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

    that

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

    returns

    A value x where

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

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

    Definition Classes
    IterableOps
  71. def sizeCompare(otherSize: Int): Int

    Compares the size of this view to a test value.

    Compares the size of this view to a test value.

    otherSize

    the test value that gets compared with the size.

    returns

    A value x where

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

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

    Definition Classes
    IterableOps
    See also

    sizeIs

  72. final def sizeIs: SizeCompareOps

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

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

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

    this.sizeIs < size     // this.sizeCompare(size) < 0
    this.sizeIs <= size    // this.sizeCompare(size) <= 0
    this.sizeIs == size    // this.sizeCompare(size) == 0
    this.sizeIs != size    // this.sizeCompare(size) != 0
    this.sizeIs >= size    // this.sizeCompare(size) >= 0
    this.sizeIs > size     // this.sizeCompare(size) > 0
    Definition Classes
    IterableOps
    Annotations
    @inline()
  73. def slice(from: Int, until: Int): View[B]

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    from

    the lowest index to include from this view.

    until

    the lowest index to EXCLUDE from this view.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  74. def sliding(size: Int, step: Int): Iterator[View[B]]

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

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

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

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

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

    Definition Classes
    IterableOps
    Examples:
    1. List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))

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

    See also

    scala.collection.Iterator, method sliding

  75. def sliding(size: Int): Iterator[View[B]]

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

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

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

    size

    the number of elements per group

    returns

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

    Definition Classes
    IterableOps
    Examples:
    1. List().sliding(2) = empty iterator

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

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

    6. ,
    7. List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))

    See also

    scala.collection.Iterator, method sliding

  76. def span(p: (B) => Boolean): (View[B], View[B])

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

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

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

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

    p

    the test predicate

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  77. def splitAt(n: Int): (View[B], View[B])

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

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

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

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

    n

    the position at which to split.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  78. def stepper[S <: Stepper[_]](implicit shape: StepperShape[B, 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.

    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
  79. def sum[B >: B](implicit num: math.Numeric[B]): B

    Sums the elements of this collection.

    Sums the elements of this collection.

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

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the + operator.

    num

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

    returns

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

    Definition Classes
    IterableOnceOps
  80. def tail: View[B]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Definition Classes
    IterableOps
  81. def tails: Iterator[View[B]]

    Iterates over the tails of this view.

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

    returns

    an iterator over all the tails of this view

    Definition Classes
    IterableOps
    Example:
    1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

  82. def take(n: Int): View[B]

    Selects the first n elements.

    Selects the first n elements.

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

    n

    the number of elements to take from this view.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  83. def takeRight(n: Int): View[B]

    Selects the last n elements.

    Selects the last n elements.

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

    n

    the number of elements to take from this view.

    returns

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

    Definition Classes
    IterableOps
  84. def takeWhile(p: (B) => Boolean): View[B]

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
  85. def tapEach[U](f: (B) => U): View[B]

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

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

    U

    the return type of f

    f

    a function to apply to each element in this view

    returns

    The same logical collection as this

    Definition Classes
    IterableOpsIterableOnceOps
  86. def to[C1](factory: Factory[B, C1]): C1

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

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

    xs.to(List)
    xs.to(ArrayBuffer)
    xs.to(BitSet) // for xs: Iterable[Int]
    Definition Classes
    IterableOnceOps
  87. def toArray[B >: B](implicit arg0: ClassTag[B]): Array[B]

    Converts this view to an Array.

    Converts this view to an Array.

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

    B

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

    returns

    This view as an Array[B].

    Definition Classes
    IterableOnceOps
  88. final def toBuffer[B >: B]: Buffer[B]

    Converts this view to a Buffer.

    Converts this view to a Buffer.

    B

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

    returns

    This view as a Buffer[B].

    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  89. def toIndexedSeq: immutable.IndexedSeq[B]

    Converts this view to an IndexedSeq.

    Converts this view to an IndexedSeq.

    returns

    This view as an IndexedSeq[A].

    Definition Classes
    IterableOnceOps
  90. def toList: immutable.List[B]

    Converts this view to a List.

    Converts this view to a List.

    returns

    This view as a List[A].

    Definition Classes
    IterableOnceOps
  91. def toMap[K, V](implicit ev: <:<[B, (K, V)]): immutable.Map[K, V]

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

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

    K

    The key type for the resulting map.

    V

    The value type for the resulting map.

    ev

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

    returns

    This view as a Map[K, V].

    Definition Classes
    IterableOnceOps
  92. def toSeq: immutable.Seq[B]

    returns

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

    Definition Classes
    IterableOnceOps
  93. def toSet[B >: B]: immutable.Set[B]

    Converts this view to a Set.

    Converts this view to a Set.

    B

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

    returns

    This view as a Set[B].

    Definition Classes
    IterableOnceOps
  94. def toString(): String

    Converts this view to a string.

    Converts this view to a string.

    returns

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

    Definition Classes
    ViewIterable → AnyRef → Any
  95. def toVector: immutable.Vector[B]

    Converts this view to a Vector.

    Converts this view to a Vector.

    returns

    This view as a Vector[A].

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

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

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

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

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

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

    B

    the type of the elements of each iterable collection.

    asIterable

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

    returns

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

    Definition Classes
    IterableOps
    Exceptions thrown

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

  97. def unzip[A1, A2](implicit asPair: (B) => (A1, A2)): (View[A1], View[A2])

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

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

    val xs = `View`(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (`View`(1, 2, 3),
    //        `View`(one, two, three))
    A1

    the type of the first half of the element pairs

    A2

    the type of the second half of the element pairs

    asPair

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

    returns

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

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

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

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

    val xs = `View`(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (`View`(1, 2, 3),
    //        `View`(one, two, three),
    //        `View`(1, 2, 3))
    A1

    the type of the first member of the element triples

    A2

    the type of the second member of the element triples

    A3

    the type of the third member of the element triples

    asTriple

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

    returns

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

    Definition Classes
    IterableOps
  99. def view: View[B]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Definition Classes
    ViewIterableOps
  100. def withFilter(p: (B) => Boolean): WithFilter[B, [_]View[_]]

    Creates a non-strict filter of this view.

    Creates a non-strict filter of this view.

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

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

    p

    the predicate used to test elements.

    returns

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

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

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

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

    B

    the type of the second half of the returned pairs

    that

    The iterable providing the second half of each result pair

    returns

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

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

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

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

    that

    the iterable providing the second half of each result pair

    thisElem

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

    thatElem

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

    returns

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

    Definition Classes
    IterableOps
  103. def zipWithIndex: View[(B, Int)]

    Zips this view with its indices.

    Zips this view with its indices.

    returns

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

    Definition Classes
    IterableOpsIterableOnceOps
    Example:
    1. List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Deprecated Value Members

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

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

  2. def /:[B](z: B)(op: (B, B) => B): B
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  3. final def /:[B](z: B)(op: (B, B) => B): B
    Definition Classes
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    Deprecated

    (Since version 2.13.0) Use foldLeft instead of /:

  4. def :\[B](z: B)(op: (B, B) => B): B
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  5. final def :\[B](z: B)(op: (B, B) => B): B
    Definition Classes
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    Deprecated

    (Since version 2.13.0) Use foldRight instead of :\

  6. def aggregate[B](z: => B)(seqop: (B, B) => 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
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    Annotations
    @deprecated
    Deprecated

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

  7. def collectFirst[B](f: PartialFunction[B, B]): Option[B]
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  8. def companion: IterableFactory[[_]View[_]]
    Definition Classes
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    (Since version 2.13.0) Use iterableFactory instead

  9. def copyToBuffer(dest: Buffer[B]): Unit
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  10. final def copyToBuffer[B >: B](dest: Buffer[B]): Unit
    Definition Classes
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    Deprecated

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

  11. def count(f: (B) => Boolean): Int
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  12. def exists(f: (B) => Boolean): Boolean
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  13. def filter(f: (B) => Boolean): Iterator[B]
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  14. def find(p: (B) => Boolean): Option[B]
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  15. def flatMap[B](f: (B) => IterableOnce[B]): IterableOnce[B]
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  16. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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  17. def foldLeft[B](z: B)(op: (B, B) => B): B
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  18. def foldRight[B](z: B)(op: (B, B) => B): B
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  19. def forall(f: (B) => Boolean): Boolean
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  20. def force: IndexedSeq[B]
    Definition Classes
    View
    Annotations
    @deprecated @inline()
    Deprecated

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

  21. def foreach[U](f: (B) => U): Unit
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  22. def hasDefiniteSize: Boolean

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

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

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

    returns

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

    Definition Classes
    IterableOnceOps
    Annotations
    @deprecated
    Deprecated

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

    See also

    method knownSize for a more useful alternative

  23. def isEmpty: Boolean
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  24. def map[B](f: (B) => B): IterableOnce[B]
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  25. def max(implicit ord: math.Ordering[B]): B
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  26. def maxBy[B](f: (B) => B)(implicit cmp: math.Ordering[B]): B
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  27. def min(implicit ord: math.Ordering[B]): B
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  28. def minBy[B](f: (B) => B)(implicit cmp: math.Ordering[B]): B
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  29. def mkString: String
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  30. def mkString(sep: String): String
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  31. def mkString(start: String, sep: String, end: String): String
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  32. def nonEmpty: Boolean
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  33. def product(implicit num: math.Numeric[B]): B
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  34. def reduce(f: (B, B) => B): B
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  35. def reduceLeft(f: (B, B) => B): B
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  36. def reduceLeftOption(f: (B, B) => B): Option[B]
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    @deprecated
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    (Since version 2.13.0) Use .iterator.reduceLeftOption(...) instead

  37. def reduceOption(f: (B, B) => B): Option[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).reduceOption(f)
    Definition Classes
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    Deprecated

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

  38. def reduceRight(f: (B, B) => B): B
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).reduceRight(f)
    Definition Classes
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    (Since version 2.13.0) Use .iterator.reduceRight(...) instead

  39. def reduceRightOption(f: (B, B) => B): Option[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] 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.reduceRightOption(...) instead

  40. final def repr: View[B]
    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  41. def sameElements[B >: A](that: IterableOnce[B]): Boolean
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Definition Classes
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    Deprecated

    (Since version 2.13.0) Use .iterator.sameElements instead

  42. def seq: Collect.this.type
    Definition Classes
    Iterable
    Annotations
    @deprecated
    Deprecated

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

  43. def size: Int
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.size instead

  44. def sum(implicit num: math.Numeric[B]): B
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.sum instead

  45. def to[C1](factory: Factory[B, C1]): C1
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.to(factory) instead

  46. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.toArray

  47. def toBuffer[B >: A]: Buffer[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.to(ArrayBuffer) instead

  48. def toIndexedSeq: IndexedSeq[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.toIndexedSeq instead

  49. final def toIterable: Iterable[B]
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    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Deprecated

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

  50. final def toIterable: Collect.this.type

    returns

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

    Definition Classes
    IterableIterableOps
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    @deprecated
    Deprecated

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

  51. def toIterator: Iterator[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator instead

  52. final def toIterator: Iterator[B]
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

  53. def toList: immutable.List[B]
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    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).toList
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    (Since version 2.13.0) Use .iterator.to(List) instead

  54. def toMap[K, V](implicit ev: <:<[B, (K, V)]): immutable.Map[K, V]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).toMap(ev)
    Definition Classes
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    (Since version 2.13.0) Use .iterator.to(Map) instead

  55. def toSeq: immutable.Seq[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Deprecated

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

  56. def toSet[B >: A]: immutable.Set[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Deprecated

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

  57. def toStream: immutable.Stream[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).toStream
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    Deprecated

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

  58. final def toStream: immutable.Stream[B]
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

  59. final def toTraversable: Traversable[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    Deprecated

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

  60. final def toTraversable: Traversable[B]

    Converts this view to an unspecified Iterable.

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

    returns

    An Iterable containing all elements of this view.

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  61. def toVector: immutable.Vector[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).toVector
    Definition Classes
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    @deprecated @inline()
    Deprecated

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

  62. def view(from: Int, until: Int): View[B]

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

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

    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

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

  63. def withFilter(f: (B) => Boolean): Iterator[B]
    Implicit
    This member is added by an implicit conversion from Collect[A, B] toIterableOnceExtensionMethods[B] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (collect: IterableOnceExtensionMethods[B]).withFilter(f)
    Definition Classes
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    @deprecated
    Deprecated

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