Packages

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

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

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

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

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

Consider this example for safe and unsafe use:

def f[A](it: Iterator[A]) = {
  if (it.hasNext) {            // Safe to reuse "it" after "hasNext"
    it.next()                  // Safe to reuse "it" after "next"
    val remainder = it.drop(2) // it is *not* safe to use "it" again after this line!
    remainder.take(2)          // it is *not* safe to use "remainder" after this line!
  } else it
}
Self Type
Iterator[A]
Source
Iterator.scala
Linear Supertypes
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Inherited
  1. Iterator
  2. IterableOnceOps
  3. IterableOnce
  4. AnyRef
  5. Any
Implicitly
  1. by iterableOnceExtensionMethods
  2. by any2stringadd
  3. by StringFormat
  4. by Ensuring
  5. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Type Members

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

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

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

    Typical uses can be achieved via methods grouped and sliding.

Abstract Value Members

  1. abstract def hasNext: Boolean

    Check if there is a next element available.

    Check if there is a next element available.

    returns

    true if there is a next element, false otherwise

    Note

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

  2. abstract def next(): A

    Return the next element and advance the iterator.

    Return the next element and advance the iterator.

    returns

    the next element.

    Annotations
    @throws(cause = scala.this.throws.<init>$default$1[NoSuchElementException])
    Exceptions thrown

    NoSuchElementException if there is no next element.

    Note

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

Concrete Value Members

  1. final def !=(arg0: Any): Boolean

    Test two objects for inequality.

    Test two objects for inequality.

    returns

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

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

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

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

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from Iterator[A] toany2stringadd[Iterator[A]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. final def ++[B >: A](xs: => IterableOnce[B]): Iterator[B]
    Annotations
    @inline()
  5. def ->[B](y: B): (Iterator[A], B)
    Implicit
    This member is added by an implicit conversion from Iterator[A] toArrowAssoc[Iterator[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: Any): Boolean

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

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

    returns

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

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

    Appends all elements of this iterator to a string builder.

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

    Example:

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

    the string builder to which elements are appended.

    returns

    the string builder b to which elements were appended.

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

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

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

    Example:

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

    the string builder to which elements are appended.

    sep

    the separator string.

    returns

    the string builder b to which elements were appended.

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

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

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

    Example:

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

    the string builder to which elements are appended.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    the string builder b to which elements were appended.

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

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver object is not an instance of the erasure of type T0.

  11. def buffered: BufferedIterator[A]

    Creates a buffered iterator from this iterator.

    Creates a buffered iterator from this iterator.

    returns

    a buffered iterator producing the same values as this iterator.

    Note

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

    See also

    scala.collection.BufferedIterator

  12. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

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

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

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

    B

    the element type of the returned iterator.

    pf

    the partial function which filters and maps the iterator.

    returns

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

    Definition Classes
    IteratorIterableOnceOps
  14. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

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

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

    Note: may not terminate for infinite iterators.

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

    pf

    the partial function

    returns

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

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

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

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

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

    Note: may not terminate for infinite iterators.

    elem

    the element to test.

    returns

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

    Note

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

  17. def copyToArray[B >: A](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 iterator.

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

  18. def copyToArray[B >: A](xs: Array[B], start: 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 values of this iterator.

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

    B

    the type of the elements of the array.

    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.

  19. def copyToArray[B >: A](xs: Array[B]): 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 values of this iterator.

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

    B

    the type of the elements of the array.

    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.

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

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

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

    Note: will not terminate for infinite-sized collections.

    B

    the type of the elements of that

    that

    the other collection

    p

    the test predicate, which relates elements from both collections

    returns

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

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

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

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

    Note: will not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

    Definition Classes
    IterableOnceOps
  22. def distinct: Iterator[A]

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

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

    returns

    iterator with distinct elements

    Note

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

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

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

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

    B

    the type of the elements after being transformed by f

    f

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

    returns

    iterator with distinct elements

    Note

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

  24. def drop(n: Int): Iterator[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

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

    n

    the number of elements to drop from this iterator.

    returns

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

    Definition Classes
    IteratorIterableOnceOps
  25. def dropWhile(p: (A) => Boolean): Iterator[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops 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 suffix of this iterator whose first element does not satisfy the predicate p.

    Definition Classes
    IteratorIterableOnceOps
  26. def duplicate: (Iterator[A], Iterator[A])

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

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

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

    returns

    a pair of iterators

    Note

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

    ,

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

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

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

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

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

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

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

    returns

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

    Definition Classes
    AnyRef
  32. def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

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

    See also equals in scala.Any.

    returns

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

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

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

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

    Note: may not terminate for infinite iterators.

    p

    the predicate used to test elements.

    returns

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

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

    Selects all elements of this iterator which satisfy a predicate.

    Selects all elements of this iterator which satisfy a predicate.

    p

    the predicate used to test elements.

    returns

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

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

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

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

    returns

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

    Definition Classes
    IteratorIterableOnceOps
  36. def finalize(): Unit

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

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

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

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

    not specified by SLS as a member of AnyRef

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

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

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

    Note: may not terminate for infinite iterators.

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

    p

    the predicate used to test elements.

    returns

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

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

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

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

    For example:

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

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

    // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
    def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)
    
    // lettersOf will return a Set[Char], not a Seq
    def lettersOf(words: Seq[String]) = words.toSet flatMap ((word: 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 iterator resulting from applying the given collection-valued function f to each element of this iterator and concatenating the results.

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

    Converts this iterator of traversable collections into a iterator formed by the elements of these traversable collections.

    Converts this iterator of traversable collections into a iterator formed by the elements of these traversable collections.

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

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

    the type of the elements of each traversable collection.

    returns

    a new iterator resulting from concatenating all element iterators.

    Definition Classes
    IteratorIterableOnceOps
  40. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1

    Folds the elements of this iterator using the specified associative binary operator.

    Folds the elements of this iterator using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    Note: will not terminate for infinite-sized collections.

    A1

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

    z

    a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., Nil for list concatenation, 0 for addition, or 1 for multiplication).

    op

    a binary operator that must be associative.

    returns

    the result of applying the fold operator op between all the elements and z, or z if this iterator is empty.

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

    Applies a binary operator to a start value and all elements of this iterator, going left to right.

    Applies a binary operator to a start value and all elements of this iterator, going left to right.

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this iterator, going left to right with the start value z on the left: op(...op(z, x1), x2, ..., xn) where x1, ..., xn are the elements of this iterator. Returns z if this iterator is empty.

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

    Applies a binary operator to all elements of this iterator and a start value, going right to left.

    Applies a binary operator to all elements of this iterator and a start value, going right to left.

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    z

    the start value.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this iterator, going right to left with the start value z on the right: op(x1, op(x2, ... op(xn, z)...)) where x1, ..., xn are the elements of this iterator. Returns z if this iterator is empty.

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

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

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

    Note: may not terminate for infinite iterators.

    p

    the predicate used to test elements.

    returns

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

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

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

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

    Definition Classes
    IterableOnceOps
  45. final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

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

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  46. def grouped[B >: A](size: Int): GroupedIterator[B]

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

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

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

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

  47. def hashCode(): Int

    The hashCode method for reference types.

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

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  48. def indexOf[B >: A](elem: B, from: Int): Int

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

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

    Note: may not terminate for infinite iterators.

    elem

    element to search for.

    from

    the start index

    returns

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

    Note

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

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

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

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

    Note: may not terminate for infinite iterators.

    elem

    element to search for.

    returns

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

    Note

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

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

    Tests whether the iterator is empty.

    Tests whether the iterator is empty.

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

    returns

    true if the iterator contains no elements, false otherwise.

    Definition Classes
    IteratorIterableOnceOps
    Annotations
    @deprecatedOverriding()
  52. final def isInstanceOf[T0]: Boolean

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

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

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

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

    This is exactly equivalent to the type pattern _: T0

    returns

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

    Definition Classes
    Any
    Note

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

  53. def isTraversableAgain: Boolean

    Tests whether this iterator can be repeatedly traversed.

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

    returns

    true if it is repeatedly traversable, false otherwise.

    Definition Classes
    IterableOnceOps
  54. final def iterator: Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

    Definition Classes
    IteratorIterableOnce
    Annotations
    @inline()
  55. def knownSize: Int

    returns

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

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

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

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

    B

    the element type of the returned iterator.

    f

    the function to apply to each element.

    returns

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

    Definition Classes
    IteratorIterableOnceOps
  58. def max[B >: A](implicit ord: math.Ordering[B]): A

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

  59. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

  60. def maxByOption[B](f: (A) => B)(implicit cmp: math.Ordering[B]): Option[A]

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the largest element.

    Finds the largest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

  63. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

  64. def minByOption[B](f: (A) => B)(implicit cmp: math.Ordering[B]): Option[A]

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

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

    Note: will not terminate for infinite-sized collections.

    B

    The result type of the function f.

    f

    The measuring function.

    cmp

    An ordering to be used for comparing elements.

    returns

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

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

    Finds the smallest element.

    Finds the smallest element.

    Note: will not terminate for infinite-sized collections.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

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

    Definition Classes
    IterableOnceOps
  66. final def mkString: String

    Displays all elements of this iterator in a string.

    Displays all elements of this iterator in a string.

    Delegates to addString, which can be overridden.

    returns

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

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

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

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

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

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

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

    Delegates to addString, which can be overridden.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

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

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

  69. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

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

    Definition Classes
    AnyRef
  70. def nextOption(): Option[A]

    Wraps the value of next() in an option.

    Wraps the value of next() in an option.

    returns

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

  71. def nonEmpty: Boolean

    Tests whether the iterator is not empty.

    Tests whether the iterator is not empty.

    returns

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

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

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  73. final def notifyAll(): Unit

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

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

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

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

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

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

    B

    the element type of the returned iterator.

    len

    the target length

    elem

    the padding value

    returns

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

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

    Partitions this iterator in two iterators according to a predicate.

    Partitions this iterator in two iterators according to a predicate.

    p

    the predicate on which to partition

    returns

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

    Note

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

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

    Returns this iterator with patched values.

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

    from

    The start index from which to patch

    patchElems

    The iterator of patch values

    replaced

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

    Note

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

  77. def product[B >: A](implicit num: math.Numeric[B]): B

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the * operator.

    num

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

    returns

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

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

    Reduces the elements of this iterator using the specified associative binary operator.

    Reduces the elements of this iterator using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    B

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

    op

    A binary operator that must be associative.

    returns

    The result of applying reduce operator op between all the elements if the iterator is nonempty.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

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

    Applies a binary operator to all elements of this iterator, going left to right.

    Applies a binary operator to all elements of this iterator, going left to right.

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this iterator, going left to right: op( op( ... op(x1, x2) ..., xn-1), xn) where x1, ..., xn are the elements of this iterator.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

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

    Optionally applies a binary operator to all elements of this iterator, going left to right.

    Optionally applies a binary operator to all elements of this iterator, going left to right.

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    an option value containing the result of reduceLeft(op) if this iterator is nonempty, None otherwise.

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

    Reduces the elements of this iterator, if any, using the specified associative binary operator.

    Reduces the elements of this iterator, if any, using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    B

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

    op

    A binary operator that must be associative.

    returns

    An option value containing result of applying reduce operator op between all the elements if the collection is nonempty, and None otherwise.

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

    Applies a binary operator to all elements of this iterator, going right to left.

    Applies a binary operator to all elements of this iterator, going right to left.

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    the result of inserting op between consecutive elements of this iterator, going right to left: op(x1, op(x2, ..., op(xn-1, xn)...)) where x1, ..., xn are the elements of this iterator.

    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterator is empty.

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

    Optionally applies a binary operator to all elements of this iterator, going right to left.

    Optionally applies a binary operator to all elements of this iterator, going right to left.

    Note: will not terminate for infinite-sized collections.

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

    B

    the result type of the binary operator.

    op

    the binary operator.

    returns

    an option value containing the result of reduceRight(op) if this iterator is nonempty, None otherwise.

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

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

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

    B

    the type of the elements of collection that.

    that

    the collection to compare

    returns

    true if both collections contain equal elements in the same order, false otherwise. <invalid inheritdoc annotation>

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

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

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

    Note: will not terminate for infinite-sized collections.

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

    B

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Definition Classes
    IteratorIterableOnceOps
  87. def size: Int

    The size of this iterator.

    The size of this iterator.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this iterator.

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

    Selects an interval of elements.

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

    from <= indexOf(x) < until

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

    from

    the lowest index to include from this iterator.

    until

    the lowest index to EXCLUDE from this iterator.

    returns

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

    Definition Classes
    IteratorIterableOnceOps
  89. def sliceIterator(from: Int, until: Int): Iterator[A]

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

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

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

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

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

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

    Example usages:

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

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

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

    Note

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

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

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

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

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

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

    p

    the test predicate

    returns

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

    Definition Classes
    IteratorIterableOnceOps
    Note

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

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

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

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

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

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

    n

    the position at which to split.

    returns

    a pair of iterators consisting of the first n elements of this iterator, and the other elements.

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

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

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

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

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

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

    Definition Classes
    IterableOnce
  94. def sum[B >: A](implicit num: math.Numeric[B]): B

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    Note: will not terminate for infinite-sized collections.

    B

    the result type of the + operator.

    num

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

    returns

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

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

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

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

    returns

    the result of body

    Definition Classes
    AnyRef
  96. def take(n: Int): Iterator[A]

    Selects the first n elements.

    Selects the first n elements.

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

    n

    the number of elements to take from this iterator.

    returns

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

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

    Takes longest prefix of elements that satisfy a predicate.

    Takes longest prefix of elements that satisfy a predicate.

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

    p

    The predicate used to test elements.

    returns

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

    Definition Classes
    IteratorIterableOnceOps
  98. def tapEach[U](f: (A) => U): Iterator[A]

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

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

    U

    the return type of f

    f

    a function to apply to each element in this iterator

    returns

    The same logical collection as this

    Definition Classes
    IteratorIterableOnceOps
  99. def to[C1](factory: Factory[A, C1]): C1

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

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

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

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

    Convert collection to array.

    Convert collection to array.

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

    Definition Classes
    IterableOnceOps
  101. final def toBuffer[B >: A]: Buffer[B]
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  102. def toIndexedSeq: immutable.IndexedSeq[A]
    Definition Classes
    IterableOnceOps
  103. def toList: immutable.List[A]
    Definition Classes
    IterableOnceOps
  104. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Definition Classes
    IterableOnceOps
  105. def toSeq: immutable.Seq[A]

    returns

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

    Definition Classes
    IterableOnceOps
  106. def toSet[B >: A]: immutable.Set[B]
    Definition Classes
    IterableOnceOps
  107. def toString(): String

    Converts this iterator to a string.

    Converts this iterator to a string.

    returns

    "<iterator>"

    Definition Classes
    Iterator → AnyRef → Any
    Note

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

  108. def toVector: immutable.Vector[A]
    Definition Classes
    IterableOnceOps
  109. final def wait(): Unit

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

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

    not specified by SLS as a member of AnyRef

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

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

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

    not specified by SLS as a member of AnyRef

  111. final def wait(arg0: Long): Unit

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

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

    not specified by SLS as a member of AnyRef

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

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

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

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

    p

    the predicate used to test values.

    returns

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

    Note

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

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

    Zips this iterator with its indices.

    Zips this iterator with its indices.

    returns

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

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

Deprecated Value Members

  1. def /:[B](z: B)(op: (B, A) => B): B
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  2. final def /:[B](z: B)(op: (B, A) => B): B
    Definition Classes
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    Annotations
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    (Since version 2.13.0) Use foldLeft instead of /:

  3. def :\[B](z: B)(op: (A, B) => B): B
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  4. final def :\[B](z: B)(op: (A, B) => B): B
    Definition Classes
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    (Since version 2.13.0) Use foldRight instead of :\

  5. def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B
    Definition Classes
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    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.

  6. def collectFirst[B](f: PartialFunction[A, B]): Option[B]
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  7. def copyToBuffer(dest: Buffer[A]): Unit
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  8. final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
    Definition Classes
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  9. def count(f: (A) => Boolean): Int
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  10. def exists(f: (A) => Boolean): Boolean
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  11. def filter(f: (A) => Boolean): Iterator[A]
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  12. def find(p: (A) => Boolean): Option[A]
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  13. def flatMap[B](f: (A) => IterableOnce[B]): IterableOnce[B]
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  14. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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  15. def foldLeft[B](z: B)(op: (B, A) => B): B
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  16. def foldRight[B](z: B)(op: (A, B) => B): B
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  17. def forall(f: (A) => Boolean): Boolean
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  18. def foreach[U](f: (A) => U): Unit
    Implicit
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  19. def formatted(fmtstr: String): String

    Returns string formatted according to given format string.

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

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

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

  20. final def hasDefiniteSize: Boolean

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

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

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

    returns

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

    Definition Classes
    IteratorIterableOnceOps
    Annotations
    @deprecated @inline()
    Deprecated

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

    See also

    method knownSize for a more useful alternative

  21. def isEmpty: Boolean
    Implicit
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  22. def map[B](f: (A) => B): IterableOnce[B]
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  23. def max(implicit ord: math.Ordering[A]): A
    Implicit
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  24. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  25. def min(implicit ord: math.Ordering[A]): A
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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    (Since version 2.13.0) Use .iterator.min instead

  26. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  27. def mkString: String
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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  28. def mkString(sep: String): String
    Implicit
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  29. def mkString(start: String, sep: String, end: String): String
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  30. def nonEmpty: Boolean
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  31. def product(implicit num: math.Numeric[A]): A
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  32. def reduce(f: (A, A) => A): A
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  33. def reduceLeft(f: (A, A) => A): A
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  34. def reduceLeftOption(f: (A, A) => A): Option[A]
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  35. def reduceOption(f: (A, A) => A): Option[A]
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  36. def reduceRight(f: (A, A) => A): A
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  37. def reduceRightOption(f: (A, A) => A): Option[A]
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  38. def sameElements[B >: A](that: IterableOnce[B]): Boolean
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  39. def scanRight[B](z: B)(op: (A, B) => B): Iterator[B]
    Annotations
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    (Since version 2.13.0) Call scanRight on an Iterable instead.

  40. def seq: Iterator.this.type
    Annotations
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    (Since version 2.13.0) Iterator.seq always returns the iterator itself

  41. def size: Int
    Implicit
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  42. def sum(implicit num: math.Numeric[A]): A
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  43. def to[C1](factory: Factory[A, C1]): C1
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  44. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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  45. def toBuffer[B >: A]: Buffer[B]
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    (iterator: IterableOnceExtensionMethods[A]).toBuffer
    Definition Classes
    IterableOnceExtensionMethods
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    @deprecated
    Deprecated

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

  46. def toIndexedSeq: IndexedSeq[A]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toIndexedSeq
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.toIndexedSeq instead

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

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

  48. def toIterator: Iterator[A]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toIterator
    Definition Classes
    IterableOnceExtensionMethods
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    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator instead

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

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

  50. def toList: immutable.List[A]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toList
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

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

  51. def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
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    (iterator: IterableOnceExtensionMethods[A]).toMap(ev)
    Definition Classes
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    @deprecated
    Deprecated

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

  52. def toSeq: immutable.Seq[A]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toSeq
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

  53. def toSet[B >: A]: immutable.Set[B]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toSet
    Definition Classes
    IterableOnceExtensionMethods
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    @deprecated @inline()
    Deprecated

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

  54. def toStream: immutable.Stream[A]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toStream
    Definition Classes
    IterableOnceExtensionMethods
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    @deprecated @inline()
    Deprecated

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

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

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

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

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

  57. def toVector: immutable.Vector[A]
    Implicit
    This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is shadowed by one or more members in this class.
    To access this member you can use a type ascription:
    (iterator: IterableOnceExtensionMethods[A]).toVector
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

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

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

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

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

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

Inherited from IterableOnceOps[A, Iterator, Iterator[A]]

Inherited from IterableOnce[A]

Inherited from AnyRef

Inherited from Any

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

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

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

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

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

Ungrouped