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-<!doctype html>
-
-<title>CodeMirror: Scala mode</title>
-<meta charset="utf-8"/>
-<link rel=stylesheet href="../../doc/docs.css">
-
-<link rel="stylesheet" href="../../lib/codemirror.css">
-<link rel="stylesheet" href="../../theme/ambiance.css">
-<script src="../../lib/codemirror.js"></script>
-<script src="../../addon/edit/matchbrackets.js"></script>
-<script src="clike.js"></script>
-<div id=nav>
- <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
-
- <ul>
- <li><a href="../../index.html">Home</a>
- <li><a href="../../doc/manual.html">Manual</a>
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- <li><a class=active href="#">Scala</a>
- </ul>
-</div>
-
-<article>
-<h2>Scala mode</h2>
-<form>
-<textarea id="code" name="code">
-
- /* __ *\
- ** ________ ___ / / ___ Scala API **
- ** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
- ** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
- ** /____/\___/_/ |_/____/_/ | | **
- ** |/ **
- \* */
-
- package scala.collection
-
- import generic._
- import mutable.{ Builder, ListBuffer }
- import annotation.{tailrec, migration, bridge}
- import annotation.unchecked.{ uncheckedVariance => uV }
- import parallel.ParIterable
-
- /** A template trait for traversable collections of type `Traversable[A]`.
- *
- * $traversableInfo
- * @define mutability
- * @define traversableInfo
- * This is a base trait of all kinds of $mutability Scala collections. It
- * implements the behavior common to all collections, in terms of a method
- * `foreach` with signature:
- * {{{
- * def foreach[U](f: Elem => U): Unit
- * }}}
- * Collection classes mixing in this trait provide a concrete
- * `foreach` method which traverses all the
- * elements contained in the collection, applying a given function to each.
- * They also need to provide a method `newBuilder`
- * which creates a builder for collections of the same kind.
- *
- * A traversable class might or might not have two properties: strictness
- * and orderedness. Neither is represented as a type.
- *
- * The instances of a strict collection class have all their elements
- * computed before they can be used as values. By contrast, instances of
- * a non-strict collection class may defer computation of some of their
- * elements until after the instance is available as a value.
- * A typical example of a non-strict collection class is a
- * <a href="../immutable/Stream.html" target="ContentFrame">
- * `scala.collection.immutable.Stream`</a>.
- * A more general class of examples are `TraversableViews`.
- *
- * If a collection is an instance of an ordered collection class, traversing
- * its elements with `foreach` will always visit elements in the
- * same order, even for different runs of the program. If the class is not
- * ordered, `foreach` can visit elements in different orders for
- * different runs (but it will keep the same order in the same run).'
- *
- * A typical example of a collection class which is not ordered is a
- * `HashMap` of objects. The traversal order for hash maps will
- * depend on the hash codes of its elements, and these hash codes might
- * differ from one run to the next. By contrast, a `LinkedHashMap`
- * is ordered because it's `foreach` method visits elements in the
- * order they were inserted into the `HashMap`.
- *
- * @author Martin Odersky
- * @version 2.8
- * @since 2.8
- * @tparam A the element type of the collection
- * @tparam Repr the type of the actual collection containing the elements.
- *
- * @define Coll Traversable
- * @define coll traversable collection
- */
- trait TraversableLike[+A, +Repr] extends HasNewBuilder[A, Repr]
- with FilterMonadic[A, Repr]
- with TraversableOnce[A]
- with GenTraversableLike[A, Repr]
- with Parallelizable[A, ParIterable[A]]
- {
- self =>
-
- import Traversable.breaks._
-
- /** The type implementing this traversable */
- protected type Self = Repr
-
- /** The collection of type $coll underlying this `TraversableLike` object.
- * By default this is implemented as the `TraversableLike` object itself,
- * but this can be overridden.
- */
- def repr: Repr = this.asInstanceOf[Repr]
-
- /** The underlying collection seen as an instance of `$Coll`.
- * By default this is implemented as the current collection object itself,
- * but this can be overridden.
- */
- protected[this] def thisCollection: Traversable[A] = this.asInstanceOf[Traversable[A]]
-
- /** A conversion from collections of type `Repr` to `$Coll` objects.
- * By default this is implemented as just a cast, but this can be overridden.
- */
- protected[this] def toCollection(repr: Repr): Traversable[A] = repr.asInstanceOf[Traversable[A]]
-
- /** Creates a new builder for this collection type.
- */
- protected[this] def newBuilder: Builder[A, Repr]
-
- protected[this] def parCombiner = ParIterable.newCombiner[A]
-
- /** Applies a function `f` to all elements of this $coll.
- *
- * Note: this method underlies the implementation of most other bulk operations.
- * It's important to implement this method in an efficient way.
- *
- *
- * @param f the function that is applied for its side-effect to every element.
- * The result of function `f` is discarded.
- *
- * @tparam U the type parameter describing the result of function `f`.
- * This result will always be ignored. Typically `U` is `Unit`,
- * but this is not necessary.
- *
- * @usecase def foreach(f: A => Unit): Unit
- */
- def foreach[U](f: A => U): Unit
-
- /** Tests whether this $coll is empty.
- *
- * @return `true` if the $coll contain no elements, `false` otherwise.
- */
- def isEmpty: Boolean = {
- var result = true
- breakable {
- for (x <- this) {
- result = false
- break
- }
- }
- result
- }
-
- /** Tests whether this $coll 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.
- *
- * Note: many collection methods will not work on collections of infinite sizes.
- *
- * @return `true` if this collection is known to have finite size, `false` otherwise.
- */
- def hasDefiniteSize = true
-
- def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- if (that.isInstanceOf[IndexedSeqLike[_, _]]) b.sizeHint(this, that.seq.size)
- b ++= thisCollection
- b ++= that.seq
- b.result
- }
-
- @bridge
- def ++[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That =
- ++(that: GenTraversableOnce[B])(bf)
-
- /** Concatenates this $coll with the elements of a traversable collection.
- * It differs from ++ in that the right operand determines the type of the
- * resulting collection rather than the left one.
- *
- * @param that the traversable to append.
- * @tparam B the element type of the returned collection.
- * @tparam That $thatinfo
- * @param bf $bfinfo
- * @return a new collection of type `That` which contains all elements
- * of this $coll followed by all elements of `that`.
- *
- * @usecase def ++:[B](that: TraversableOnce[B]): $Coll[B]
- *
- * @return a new $coll which contains all elements of this $coll
- * followed by all elements of `that`.
- */
- def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- if (that.isInstanceOf[IndexedSeqLike[_, _]]) b.sizeHint(this, that.size)
- b ++= that
- b ++= thisCollection
- b.result
- }
-
- /** This overload exists because: for the implementation of ++: we should reuse
- * that of ++ because many collections override it with more efficient versions.
- * Since TraversableOnce has no '++' method, we have to implement that directly,
- * but Traversable and down can use the overload.
- */
- def ++:[B >: A, That](that: Traversable[B])(implicit bf: CanBuildFrom[Repr, B, That]): That =
- (that ++ seq)(breakOut)
-
- def map[B, That](f: A => B)(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- b.sizeHint(this)
- for (x <- this) b += f(x)
- b.result
- }
-
- def flatMap[B, That](f: A => GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- for (x <- this) b ++= f(x).seq
- b.result
- }
-
- /** Selects all elements of this $coll which satisfy a predicate.
- *
- * @param p the predicate used to test elements.
- * @return a new $coll consisting of all elements of this $coll that satisfy the given
- * predicate `p`. The order of the elements is preserved.
- */
- def filter(p: A => Boolean): Repr = {
- val b = newBuilder
- for (x <- this)
- if (p(x)) b += x
- b.result
- }
-
- /** Selects all elements of this $coll which do not satisfy a predicate.
- *
- * @param p the predicate used to test elements.
- * @return a new $coll consisting of all elements of this $coll that do not satisfy the given
- * predicate `p`. The order of the elements is preserved.
- */
- def filterNot(p: A => Boolean): Repr = filter(!p(_))
-
- def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- for (x <- this) if (pf.isDefinedAt(x)) b += pf(x)
- b.result
- }
-
- /** Builds a new collection by applying an option-valued function to all
- * elements of this $coll on which the function is defined.
- *
- * @param f the option-valued function which filters and maps the $coll.
- * @tparam B the element type of the returned collection.
- * @tparam That $thatinfo
- * @param bf $bfinfo
- * @return a new collection of type `That` resulting from applying the option-valued function
- * `f` to each element and collecting all defined results.
- * The order of the elements is preserved.
- *
- * @usecase def filterMap[B](f: A => Option[B]): $Coll[B]
- *
- * @param pf the partial function which filters and maps the $coll.
- * @return a new $coll resulting from applying the given option-valued function
- * `f` to each element and collecting all defined results.
- * The order of the elements is preserved.
- def filterMap[B, That](f: A => Option[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- for (x <- this)
- f(x) match {
- case Some(y) => b += y
- case _ =>
- }
- b.result
- }
- */
-
- /** Partitions this $coll in two ${coll}s according to a predicate.
- *
- * @param p the predicate on which to partition.
- * @return a pair of ${coll}s: the first $coll consists of all elements that
- * satisfy the predicate `p` and the second $coll consists of all elements
- * that don't. The relative order of the elements in the resulting ${coll}s
- * is the same as in the original $coll.
- */
- def partition(p: A => Boolean): (Repr, Repr) = {
- val l, r = newBuilder
- for (x <- this) (if (p(x)) l else r) += x
- (l.result, r.result)
- }
-
- def groupBy[K](f: A => K): immutable.Map[K, Repr] = {
- val m = mutable.Map.empty[K, Builder[A, Repr]]
- for (elem <- this) {
- val key = f(elem)
- val bldr = m.getOrElseUpdate(key, newBuilder)
- bldr += elem
- }
- val b = immutable.Map.newBuilder[K, Repr]
- for ((k, v) <- m)
- b += ((k, v.result))
-
- b.result
- }
-
- /** Tests whether a predicate holds for all elements of this $coll.
- *
- * $mayNotTerminateInf
- *
- * @param p the predicate used to test elements.
- * @return `true` if the given predicate `p` holds for all elements
- * of this $coll, otherwise `false`.
- */
- def forall(p: A => Boolean): Boolean = {
- var result = true
- breakable {
- for (x <- this)
- if (!p(x)) { result = false; break }
- }
- result
- }
-
- /** Tests whether a predicate holds for some of the elements of this $coll.
- *
- * $mayNotTerminateInf
- *
- * @param p the predicate used to test elements.
- * @return `true` if the given predicate `p` holds for some of the
- * elements of this $coll, otherwise `false`.
- */
- def exists(p: A => Boolean): Boolean = {
- var result = false
- breakable {
- for (x <- this)
- if (p(x)) { result = true; break }
- }
- result
- }
-
- /** Finds the first element of the $coll satisfying a predicate, if any.
- *
- * $mayNotTerminateInf
- * $orderDependent
- *
- * @param p the predicate used to test elements.
- * @return an option value containing the first element in the $coll
- * that satisfies `p`, or `None` if none exists.
- */
- def find(p: A => Boolean): Option[A] = {
- var result: Option[A] = None
- breakable {
- for (x <- this)
- if (p(x)) { result = Some(x); break }
- }
- result
- }
-
- def scan[B >: A, That](z: B)(op: (B, B) => B)(implicit cbf: CanBuildFrom[Repr, B, That]): That = scanLeft(z)(op)
-
- def scanLeft[B, That](z: B)(op: (B, A) => B)(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- b.sizeHint(this, 1)
- var acc = z
- b += acc
- for (x <- this) { acc = op(acc, x); b += acc }
- b.result
- }
-
- @migration(2, 9,
- "This scanRight definition has changed in 2.9.\n" +
- "The previous behavior can be reproduced with scanRight.reverse."
- )
- def scanRight[B, That](z: B)(op: (A, B) => B)(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- var scanned = List(z)
- var acc = z
- for (x <- reversed) {
- acc = op(x, acc)
- scanned ::= acc
- }
- val b = bf(repr)
- for (elem <- scanned) b += elem
- b.result
- }
-
- /** Selects the first element of this $coll.
- * $orderDependent
- * @return the first element of this $coll.
- * @throws `NoSuchElementException` if the $coll is empty.
- */
- def head: A = {
- var result: () => A = () => throw new NoSuchElementException
- breakable {
- for (x <- this) {
- result = () => x
- break
- }
- }
- result()
- }
-
- /** Optionally selects the first element.
- * $orderDependent
- * @return the first element of this $coll if it is nonempty, `None` if it is empty.
- */
- def headOption: Option[A] = if (isEmpty) None else Some(head)
-
- /** Selects all elements except the first.
- * $orderDependent
- * @return a $coll consisting of all elements of this $coll
- * except the first one.
- * @throws `UnsupportedOperationException` if the $coll is empty.
- */
- override def tail: Repr = {
- if (isEmpty) throw new UnsupportedOperationException("empty.tail")
- drop(1)
- }
-
- /** Selects the last element.
- * $orderDependent
- * @return The last element of this $coll.
- * @throws NoSuchElementException If the $coll is empty.
- */
- def last: A = {
- var lst = head
- for (x <- this)
- lst = x
- lst
- }
-
- /** Optionally selects the last element.
- * $orderDependent
- * @return the last element of this $coll$ if it is nonempty, `None` if it is empty.
- */
- def lastOption: Option[A] = if (isEmpty) None else Some(last)
-
- /** Selects all elements except the last.
- * $orderDependent
- * @return a $coll consisting of all elements of this $coll
- * except the last one.
- * @throws `UnsupportedOperationException` if the $coll is empty.
- */
- def init: Repr = {
- if (isEmpty) throw new UnsupportedOperationException("empty.init")
- var lst = head
- var follow = false
- val b = newBuilder
- b.sizeHint(this, -1)
- for (x <- this.seq) {
- if (follow) b += lst
- else follow = true
- lst = x
- }
- b.result
- }
-
- def take(n: Int): Repr = slice(0, n)
-
- def drop(n: Int): Repr =
- if (n <= 0) {
- val b = newBuilder
- b.sizeHint(this)
- b ++= thisCollection result
- }
- else sliceWithKnownDelta(n, Int.MaxValue, -n)
-
- def slice(from: Int, until: Int): Repr = sliceWithKnownBound(math.max(from, 0), until)
-
- // Precondition: from >= 0, until > 0, builder already configured for building.
- private[this] def sliceInternal(from: Int, until: Int, b: Builder[A, Repr]): Repr = {
- var i = 0
- breakable {
- for (x <- this.seq) {
- if (i >= from) b += x
- i += 1
- if (i >= until) break
- }
- }
- b.result
- }
- // Precondition: from >= 0
- private[scala] def sliceWithKnownDelta(from: Int, until: Int, delta: Int): Repr = {
- val b = newBuilder
- if (until <= from) b.result
- else {
- b.sizeHint(this, delta)
- sliceInternal(from, until, b)
- }
- }
- // Precondition: from >= 0
- private[scala] def sliceWithKnownBound(from: Int, until: Int): Repr = {
- val b = newBuilder
- if (until <= from) b.result
- else {
- b.sizeHintBounded(until - from, this)
- sliceInternal(from, until, b)
- }
- }
-
- def takeWhile(p: A => Boolean): Repr = {
- val b = newBuilder
- breakable {
- for (x <- this) {
- if (!p(x)) break
- b += x
- }
- }
- b.result
- }
-
- def dropWhile(p: A => Boolean): Repr = {
- val b = newBuilder
- var go = false
- for (x <- this) {
- if (!p(x)) go = true
- if (go) b += x
- }
- b.result
- }
-
- def span(p: A => Boolean): (Repr, Repr) = {
- val l, r = newBuilder
- var toLeft = true
- for (x <- this) {
- toLeft = toLeft && p(x)
- (if (toLeft) l else r) += x
- }
- (l.result, r.result)
- }
-
- def splitAt(n: Int): (Repr, Repr) = {
- val l, r = newBuilder
- l.sizeHintBounded(n, this)
- if (n >= 0) r.sizeHint(this, -n)
- var i = 0
- for (x <- this) {
- (if (i < n) l else r) += x
- i += 1
- }
- (l.result, r.result)
- }
-
- /** Iterates over the tails of this $coll. The first value will be this
- * $coll and the final one will be an empty $coll, with the intervening
- * values the results of successive applications of `tail`.
- *
- * @return an iterator over all the tails of this $coll
- * @example `List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)`
- */
- def tails: Iterator[Repr] = iterateUntilEmpty(_.tail)
-
- /** Iterates over the inits of this $coll. The first value will be this
- * $coll and the final one will be an empty $coll, with the intervening
- * values the results of successive applications of `init`.
- *
- * @return an iterator over all the inits of this $coll
- * @example `List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)`
- */
- def inits: Iterator[Repr] = iterateUntilEmpty(_.init)
-
- /** Copies elements of this $coll to an array.
- * Fills the given array `xs` with at most `len` elements of
- * this $coll, starting at position `start`.
- * Copying will stop once either the end of the current $coll is reached,
- * or the end of the array is reached, or `len` elements have been copied.
- *
- * $willNotTerminateInf
- *
- * @param xs the array to fill.
- * @param start the starting index.
- * @param len the maximal number of elements to copy.
- * @tparam B the type of the elements of the array.
- *
- *
- * @usecase def copyToArray(xs: Array[A], start: Int, len: Int): Unit
- */
- def copyToArray[B >: A](xs: Array[B], start: Int, len: Int) {
- var i = start
- val end = (start + len) min xs.length
- breakable {
- for (x <- this) {
- if (i >= end) break
- xs(i) = x
- i += 1
- }
- }
- }
-
- def toTraversable: Traversable[A] = thisCollection
- def toIterator: Iterator[A] = toStream.iterator
- def toStream: Stream[A] = toBuffer.toStream
-
- /** Converts this $coll to a string.
- *
- * @return a string representation of this collection. By default this
- * string consists of the `stringPrefix` of this $coll,
- * followed by all elements separated by commas and enclosed in parentheses.
- */
- override def toString = mkString(stringPrefix + "(", ", ", ")")
-
- /** Defines the prefix of this object's `toString` representation.
- *
- * @return a string representation which starts the result of `toString`
- * applied to this $coll. By default the string prefix is the
- * simple name of the collection class $coll.
- */
- def stringPrefix : String = {
- var string = repr.asInstanceOf[AnyRef].getClass.getName
- val idx1 = string.lastIndexOf('.' : Int)
- if (idx1 != -1) string = string.substring(idx1 + 1)
- val idx2 = string.indexOf('$')
- if (idx2 != -1) string = string.substring(0, idx2)
- string
- }
-
- /** Creates a non-strict view of this $coll.
- *
- * @return a non-strict view of this $coll.
- */
- def view = new TraversableView[A, Repr] {
- protected lazy val underlying = self.repr
- override def foreach[U](f: A => U) = self foreach f
- }
-
- /** Creates a non-strict view of a slice of this $coll.
- *
- * Note: the difference between `view` and `slice` is that `view` produces
- * a view of the current $coll, whereas `slice` produces a new $coll.
- *
- * Note: `view(from, to)` is equivalent to `view.slice(from, to)`
- * $orderDependent
- *
- * @param from the index of the first element of the view
- * @param until the index of the element following the view
- * @return a non-strict view of a slice of this $coll, starting at index `from`
- * and extending up to (but not including) index `until`.
- */
- def view(from: Int, until: Int): TraversableView[A, Repr] = view.slice(from, until)
-
- /** Creates a non-strict filter of this $coll.
- *
- * 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.
- * $orderDependent
- *
- * @param p the predicate used to test elements.
- * @return an object of class `WithFilter`, which supports
- * `map`, `flatMap`, `foreach`, and `withFilter` operations.
- * All these operations apply to those elements of this $coll which
- * satisfy the predicate `p`.
- */
- def withFilter(p: A => Boolean): FilterMonadic[A, Repr] = new WithFilter(p)
-
- /** A class supporting filtered operations. Instances of this class are
- * returned by method `withFilter`.
- */
- class WithFilter(p: A => Boolean) extends FilterMonadic[A, Repr] {
-
- /** Builds a new collection by applying a function to all elements of the
- * outer $coll containing this `WithFilter` instance that satisfy predicate `p`.
- *
- * @param f the function to apply to each element.
- * @tparam B the element type of the returned collection.
- * @tparam That $thatinfo
- * @param bf $bfinfo
- * @return a new collection of type `That` resulting from applying
- * the given function `f` to each element of the outer $coll
- * that satisfies predicate `p` and collecting the results.
- *
- * @usecase def map[B](f: A => B): $Coll[B]
- *
- * @return a new $coll resulting from applying the given function
- * `f` to each element of the outer $coll that satisfies
- * predicate `p` and collecting the results.
- */
- def map[B, That](f: A => B)(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- for (x <- self)
- if (p(x)) b += f(x)
- b.result
- }
-
- /** Builds a new collection by applying a function to all elements of the
- * outer $coll containing this `WithFilter` instance that satisfy
- * predicate `p` and concatenating the results.
- *
- * @param f the function to apply to each element.
- * @tparam B the element type of the returned collection.
- * @tparam That $thatinfo
- * @param bf $bfinfo
- * @return a new collection of type `That` resulting from applying
- * the given collection-valued function `f` to each element
- * of the outer $coll that satisfies predicate `p` and
- * concatenating the results.
- *
- * @usecase def flatMap[B](f: A => TraversableOnce[B]): $Coll[B]
- *
- * @return a new $coll resulting from applying the given collection-valued function
- * `f` to each element of the outer $coll that satisfies predicate `p` and concatenating the results.
- */
- def flatMap[B, That](f: A => GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
- val b = bf(repr)
- for (x <- self)
- if (p(x)) b ++= f(x).seq
- b.result
- }
-
- /** Applies a function `f` to all elements of the outer $coll containing
- * this `WithFilter` instance that satisfy predicate `p`.
- *
- * @param f the function that is applied for its side-effect to every element.
- * The result of function `f` is discarded.
- *
- * @tparam U the type parameter describing the result of function `f`.
- * This result will always be ignored. Typically `U` is `Unit`,
- * but this is not necessary.
- *
- * @usecase def foreach(f: A => Unit): Unit
- */
- def foreach[U](f: A => U): Unit =
- for (x <- self)
- if (p(x)) f(x)
-
- /** Further refines the filter for this $coll.
- *
- * @param q the predicate used to test elements.
- * @return an object of class `WithFilter`, which supports
- * `map`, `flatMap`, `foreach`, and `withFilter` operations.
- * All these operations apply to those elements of this $coll which
- * satisfy the predicate `q` in addition to the predicate `p`.
- */
- def withFilter(q: A => Boolean): WithFilter =
- new WithFilter(x => p(x) && q(x))
- }
-
- // A helper for tails and inits.
- private def iterateUntilEmpty(f: Traversable[A @uV] => Traversable[A @uV]): Iterator[Repr] = {
- val it = Iterator.iterate(thisCollection)(f) takeWhile (x => !x.isEmpty)
- it ++ Iterator(Nil) map (newBuilder ++= _ result)
- }
- }
-
-
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