Iterator

Companion object Iterator

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

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

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

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

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

Consider this example for safe and unsafe use:

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

Self Type: Iterator[A]
Source: Iterator.scala

Linear Supertypes

IterableOnceOps[A, Iterator, Iterator[A]], IterableOnce[A], AnyRef, Any

Known Subclasses

AbstractIterator, BufferedIterator, GroupedIterator, BufferedSource, BufferedLineIterator, Source, LineIterator, MatchIterator

Type Hierarchy

Ordering

Alphabetic
By Inheritance

Inherited

Iterator
IterableOnceOps
IterableOnce
AnyRef
Any

Implicitly

by iterableOnceExtensionMethods
by any2stringadd
by StringFormat
by Ensuring
by ArrowAssoc

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Visibility

Public
Protected

Type Members

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

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.
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

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
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
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
final def ++[B >: A](xs: => IterableOnce[B]): Iterator[B]
Annotations
@inline()
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()
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
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()
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()
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
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.
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
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
def collect[B](pf: PartialFunction[A, B]): Iterator[B]
Builds a new iterator by applying a partial function to all elements of this iterator on which the function is defined.
Builds a new iterator by applying a partial function to all elements of this iterator on which the function is defined.
B
the element type of the returned iterator.
pf
the partial function which filters and maps the iterator.
returns
a new iterator resulting from applying the given partial function pf to each element on which it is defined and collecting the results. The order of the elements is preserved.
Definition Classes
Iterator → IterableOnceOps
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)
def concat[B >: A](xs: => IterableOnce[B]): Iterator[B]
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.
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.
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.
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.
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
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
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.
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.
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
Iterator → IterableOnceOps
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
Iterator → IterableOnceOps
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.
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
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
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
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
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
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
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
def filter(p: (A) => Boolean): Iterator[A]
Selects all elements of this iterator which satisfy a predicate.
Selects all elements of this iterator which satisfy a predicate.
p
the predicate used to test elements.
returns
a new iterator consisting of all elements of this iterator that satisfy the given predicate p. The order of the elements is preserved.
Definition Classes
Iterator → IterableOnceOps
def filterNot(p: (A) => Boolean): Iterator[A]
Selects all elements of this iterator which do not satisfy a predicate.
Selects all elements of this iterator which do not satisfy a predicate.
returns
a new iterator consisting of all elements of this iterator that do not satisfy the given predicate pred. Their order may not be preserved.
Definition Classes
Iterator → IterableOnceOps
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
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
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
Iterator → IterableOnceOps
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
Iterator → IterableOnceOps
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
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, ..., x_n) where x₁, ..., x_n are the elements of this iterator. Returns z if this iterator is empty.
Definition Classes
IterableOnceOps
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(x_n, z)...)) where x₁, ..., x_n are the elements of this iterator. Returns z if this iterator is empty.
Definition Classes
IterableOnceOps
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
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
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
@inline()
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()
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.
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()
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.
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.
def indexWhere(p: (A) => Boolean, from: Int = 0): Int
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
Iterator → IterableOnceOps
Annotations
@deprecatedOverriding()
final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is T0.
Test whether the dynamic type of the receiver object is T0.
Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. 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 specified type.
returns
true if the receiver object is an instance of erasure of type T0; false otherwise.
Definition Classes
Any
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
final def iterator: Iterator[A]
Iterator can be used only once
Iterator can be used only once
Definition Classes
Iterator → IterableOnce
Annotations
@inline()
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
final def length: Int
Annotations
@inline()
def map[B](f: (A) => B): Iterator[B]
Builds a new iterator by applying a function to all elements of this iterator.
Builds a new iterator by applying a function to all elements of this iterator.
B
the element type of the returned iterator.
f
the function to apply to each element.
returns
a new iterator resulting from applying the given function f to each element of this iterator and collecting the results.
Definition Classes
Iterator → IterableOnceOps
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.
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.
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
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
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.
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.
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
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
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()
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"
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)"
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
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.
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()
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
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
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.
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.
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.
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
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.
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) ..., x_n-1), x_n) where x₁, ..., x_n are the elements of this iterator.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this iterator is empty.
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
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
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(x_n-1, x_n)...)) where x₁, ..., x_n are the elements of this iterator.
Definition Classes
IterableOnceOps
Exceptions thrown
UnsupportedOperationException if this iterator is empty.
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
def reversed: Iterable[A]
Attributes
protected
Definition Classes
IterableOnceOps
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>
def scanLeft[B](z: B)(op: (B, A) => B): Iterator[B]
Produces a iterator containing cumulative results of applying the operator going left to right, including the initial value.
Produces a iterator containing cumulative results of applying the operator going left to right, including the initial value.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
B
the type of the elements in the resulting collection
z
the initial value
op
the binary operator applied to the intermediate result and the element
returns
collection with intermediate results
Definition Classes
Iterator → IterableOnceOps
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
def slice(from: Int, until: Int): Iterator[A]
Selects an interval of elements.
Selects an interval of elements. The returned iterator is made up of all elements x which satisfy the invariant:
```
from <= indexOf(x) < until
```
Note: might return different results for different runs, unless the underlying collection type is ordered.
from
the lowest index to include from this iterator.
until
the lowest index to EXCLUDE from this iterator.
returns
a iterator containing the elements greater than or equal to index from extending up to (but not including) index until of this iterator.
Definition Classes
Iterator → IterableOnceOps
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
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.
def span(p: (A) => Boolean): (Iterator[A], Iterator[A])
Splits this iterator into a prefix/suffix pair according to a predicate.
Splits this iterator into a prefix/suffix pair according to a predicate.
Note: c span p is equivalent to (but possibly more efficient than) (c takeWhile p, c dropWhile p), provided the evaluation of the predicate p does not cause any side-effects.
Note: might return different results for different runs, unless the underlying collection type is ordered.
p
the test predicate
returns
a pair consisting of the longest prefix of this iterator whose elements all satisfy p, and the rest of this iterator.
Definition Classes
Iterator → IterableOnceOps
Note
Reuse: After calling this method, one should discard the iterator it was called on, and use only the iterators that were returned. Using the old iterator is undefined, subject to change, and may result in changes to the new iterators as well.
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
def stepper[S <: Stepper[_]](implicit shape: StepperShape[A, S]): S
Returns a scala.collection.Stepper for the elements of this collection.
Returns a scala.collection.Stepper for the elements of this collection.
The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.
The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.
- For collections of Int, Short, Byte or Char, an scala.collection.IntStepper is returned
- For collections of Double or Float, a scala.collection.DoubleStepper is returned
- For collections of Long a scala.collection.LongStepper is returned
- For any other element type, an scala.collection.AnyStepper is returned
Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.
Definition Classes
IterableOnce
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
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
def take(n: Int): Iterator[A]
Selects the first n elements.
Selects the first n elements.
Note: might return different results for different runs, unless the underlying collection type is ordered.
n
the number of elements to take from this iterator.
returns
a iterator consisting only of the first n elements of this iterator, or else the whole iterator, if it has less than n elements. If n is negative, returns an empty iterator.
Definition Classes
Iterator → IterableOnceOps
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
Iterator → IterableOnceOps
def tapEach[U](f: (A) => U): Iterator[A]
Applies a side-effecting function to each element in this collection.
Applies a side-effecting function to each element in this collection. Strict collections will apply f to their elements immediately, while lazy collections like Views and LazyLists will only apply f on each element if and when that element is evaluated, and each time that element is evaluated.
U
the return type of f
f
a function to apply to each element in this iterator
returns
The same logical collection as this
Definition Classes
Iterator → IterableOnceOps
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
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
final def toBuffer[B >: A]: Buffer[B]
Definition Classes
IterableOnceOps
Annotations
@inline()
def toIndexedSeq: immutable.IndexedSeq[A]
Definition Classes
IterableOnceOps
def toList: immutable.List[A]
Definition Classes
IterableOnceOps
def toMap[K, V](implicit ev: <:<[A, (K, V)]): immutable.Map[K, V]
Definition Classes
IterableOnceOps
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
def toSet[B >: A]: immutable.Set[B]
Definition Classes
IterableOnceOps
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.
def toVector: immutable.Vector[A]
Definition Classes
IterableOnceOps
final def wait(): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
Note
not specified by SLS as a member of AnyRef
final def wait(arg0: Long, arg1: Int): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException])
Note
not specified by SLS as a member of AnyRef
final def wait(arg0: Long): Unit
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.
See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.
Definition Classes
AnyRef
Annotations
@throws(classOf[java.lang.InterruptedException]) @native()
Note
not specified by SLS as a member of AnyRef
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.
def zip[B](that: IterableOnce[B]): Iterator[(A, B)]
def zipAll[A1 >: A, B](that: IterableOnce[B], thisElem: A1, thatElem: B): Iterator[(A1, B)]
def zipWithIndex: Iterator[(A, Int)]
Zips this iterator with its indices.
Zips this iterator with its indices.
returns
A new iterator containing pairs consisting of all elements of this iterator paired with their index. Indices start at 0.
Definition Classes
Iterator → IterableOnceOps
Example:
1. List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Deprecated Value Members

def /:[B](z: B)(op: (B, A) => B): B
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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])./:(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foldLeft instead
final def /:[B](z: B)(op: (B, A) => B): B
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use foldLeft instead of /:
def :\[B](z: B)(op: (A, B) => B): B
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
Shadowing
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]).:\(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foldRight instead
final def :\[B](z: B)(op: (A, B) => B): B
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use foldRight instead of :\
def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B
Definition Classes
IterableOnceOps
Annotations
@deprecated
Deprecated
(Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.
def collectFirst[B](f: PartialFunction[A, B]): Option[B]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).collectFirst(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.collectFirst(...) instead
def copyToBuffer(dest: Buffer[A]): Unit
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).copyToBuffer(dest)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.copyToBuffer(...) instead
final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use dest ++= coll instead
def count(f: (A) => Boolean): Int
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).count(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.count(...) instead
def exists(f: (A) => Boolean): Boolean
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).exists(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.exists(...) instead
def filter(f: (A) => Boolean): Iterator[A]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).filter(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.filter(...) instead
def find(p: (A) => Boolean): Option[A]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).find(p)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.find instead
def flatMap[B](f: (A) => IterableOnce[B]): IterableOnce[B]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).flatMap(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.flatMap instead or consider requiring an Iterable
def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).fold(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.fold instead
def foldLeft[B](z: B)(op: (B, A) => B): B
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).foldLeft(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foldLeft instead
def foldRight[B](z: B)(op: (A, B) => B): B
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).foldRight(z)(op)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foldRight instead
def forall(f: (A) => Boolean): Boolean
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).forall(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.forall(...) instead
def foreach[U](f: (A) => U): Unit
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).foreach(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.foreach(...) instead
final def hasDefiniteSize: Boolean
Tests whether this iterator is known to have a finite size.
Tests whether this iterator is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as Stream, the predicate returns true if all elements have been computed. It returns false if the stream is not yet evaluated to the end. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.
Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.
returns
true if this collection is known to have finite size, false otherwise.
Definition Classes
Iterator → IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) hasDefiniteSize on Iterator is the same as isEmpty
See also
method knownSize for a more useful alternative
def isEmpty: Boolean
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).isEmpty
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.isEmpty instead
def map[B](f: (A) => B): IterableOnce[B]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.map instead or consider requiring an Iterable
def max(implicit ord: math.Ordering[A]): A
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).max(ord)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.max instead
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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(iterator: IterableOnceExtensionMethods[A]).maxBy(f)(cmp)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.maxBy(...) instead
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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(iterator: IterableOnceExtensionMethods[A]).min(ord)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.min instead
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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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.minBy(...) instead
def mkString: String
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).mkString
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.mkString instead
def mkString(sep: String): String
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.mkString instead
def mkString(start: String, sep: String, end: String): String
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).mkString(start, sep, end)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.mkString instead
def nonEmpty: Boolean
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).nonEmpty
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.nonEmpty instead
def product(implicit num: math.Numeric[A]): A
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.product instead
def reduce(f: (A, A) => A): A
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).reduce(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.reduce(...) instead
def reduceLeft(f: (A, A) => A): A
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.reduceLeft(...) instead
def reduceLeftOption(f: (A, A) => A): Option[A]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.reduceLeftOption(...) instead
def reduceOption(f: (A, A) => A): Option[A]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.reduceOption(...) instead
def reduceRight(f: (A, A) => A): A
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.reduceRight(...) instead
def reduceRightOption(f: (A, A) => A): Option[A]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.reduceRightOption(...) instead
def sameElements[B >: A](that: IterableOnce[B]): Boolean
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.sameElements instead
def scanRight[B](z: B)(op: (A, B) => B): Iterator[B]
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Call scanRight on an Iterable instead.
def seq: Iterator.this.type
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Iterator.seq always returns the iterator itself
def size: Int
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).size
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.size instead
def sum(implicit num: math.Numeric[A]): A
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).sum(num)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.sum instead
def to[C1](factory: Factory[A, C1]): C1
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).to(factory)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.to(factory) instead
def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).toArray(arg0)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.toArray
def toBuffer[B >: A]: Buffer[B]
Implicit
This member is added by an implicit conversion from Iterator[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
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(iterator: IterableOnceExtensionMethods[A]).toBuffer
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.to(ArrayBuffer) instead
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.
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(iterator: IterableOnceExtensionMethods[A]).toIndexedSeq
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.toIndexedSeq instead
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
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.
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(iterator: IterableOnceExtensionMethods[A]).toIterator
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator instead
final def toIterator: Iterator[A]
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator instead of .toIterator
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
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(iterator: IterableOnceExtensionMethods[A]).toList
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.to(List) instead
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.
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(iterator: IterableOnceExtensionMethods[A]).toMap(ev)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.to(Map) instead
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
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(iterator: IterableOnceExtensionMethods[A]).toSeq
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(Seq) instead
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.
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(iterator: IterableOnceExtensionMethods[A]).toSet
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(Set) instead
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
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(iterator: IterableOnceExtensionMethods[A]).toStream
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(LazyList) instead
final def toStream: immutable.Stream[A]
Definition Classes
IterableOnceOps
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .to(LazyList) instead of .toStream
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
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
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(iterator: IterableOnceExtensionMethods[A]).toVector
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated @inline()
Deprecated
(Since version 2.13.0) Use .iterator.to(Vector) instead
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
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(iterator: IterableOnceExtensionMethods[A]).withFilter(f)
Definition Classes
IterableOnceExtensionMethods
Annotations
@deprecated
Deprecated
(Since version 2.13.0) Use .iterator.withFilter(...) instead
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.

Packages

Package structure

Automatic imports

Iterator

Companion object Iterator

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

Type Members

Abstract Value Members

Concrete Value Members

Deprecated Value Members

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

Packages

Package structure

Automatic imports

Iterator

Companion object Iterator

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

Type Members

Abstract Value Members

Concrete Value Members

Deprecated Value Members

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

Iterator