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/Scala 2.13 Library

Object scala.collection.View

Companion trait View

object View extends IterableFactory[View]

This object reifies operations on views as case classes

Annotations
@SerialVersionUID()
Source
View.scala
Linear Supertypes
IterableFactory[View], java.io.Serializable, AnyRef, Any

Type Members

class Appended[+A] extends AbstractView[A]

A view that appends an element to its elements

Annotations
@SerialVersionUID()

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

A view that collects elements of the underlying collection.

Annotations
@SerialVersionUID()

class Concat[A] extends AbstractView[A]

A view that concatenates elements of the prefix collection or iterator with the elements of the suffix collection or iterator.

Annotations
@SerialVersionUID()

class DistinctBy[A, B] extends AbstractView[A]

A view that removes the duplicated elements as determined by the transformation function f

Annotations
@SerialVersionUID()

class Drop[A] extends AbstractView[A]

A view that drops leading elements of the underlying collection.

Annotations
@SerialVersionUID()

class DropRight[A] extends AbstractView[A]

A view that drops trailing elements of the underlying collection.

Annotations
@SerialVersionUID()

class DropWhile[A] extends AbstractView[A]

Annotations
@SerialVersionUID()

class Elems[A] extends AbstractView[A]

A view with given elements

Annotations
@SerialVersionUID()

class Fill[A] extends AbstractView[A]

A view containing the results of some element computation a number of times.

Annotations
@SerialVersionUID()

class Filter[A] extends AbstractView[A]

A view that filters an underlying collection.

Annotations
@SerialVersionUID()

class FlatMap[A, B] extends AbstractView[B]

A view that flatmaps elements of the underlying collection.

Annotations
@SerialVersionUID()

class Iterate[A] extends AbstractView[A]

A view containing repeated applications of a function to a start value

Annotations
@SerialVersionUID()

class LeftPartitionMapped[A, A1, A2] extends AbstractView[A1]

Annotations
@SerialVersionUID()

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

A view that maps elements of the underlying collection.

Annotations
@SerialVersionUID()

class PadTo[A] extends AbstractView[A]

Annotations
@SerialVersionUID()

class Prepended[+A] extends AbstractView[A]

A view that prepends an element to its elements

Annotations
@SerialVersionUID()

class RightPartitionMapped[A, A1, A2] extends AbstractView[A2]

Annotations
@SerialVersionUID()

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

Annotations
@SerialVersionUID()

class Single[A] extends AbstractView[A]

A view with exactly one element

Annotations
@SerialVersionUID()

type SomeIterableOps[A] = IterableOps[A, AnyConstr, _]

class Tabulate[A] extends AbstractView[A]

A view containing values of a given function over a range of integer values starting from 0.

Annotations
@SerialVersionUID()

class Take[+A] extends AbstractView[A]

A view that takes leading elements of the underlying collection.

Annotations
@SerialVersionUID()

class TakeRight[+A] extends AbstractView[A]

A view that takes trailing elements of the underlying collection.

Annotations
@SerialVersionUID()

class TakeWhile[A] extends AbstractView[A]

Annotations
@SerialVersionUID()

class Unfold[A, S] extends AbstractView[A]

A view that uses a function f to produce elements of type A and update an internal state S.

Annotations
@SerialVersionUID()

class Updated[A] extends AbstractView[A]

Annotations
@SerialVersionUID()

class Zip[A, B] extends AbstractView[(A, B)]

A view that zips elements of the underlying collection with the elements of another collection.

Annotations
@SerialVersionUID()

class ZipAll[A, B] extends AbstractView[(A, B)]

A view that zips elements of the underlying collection with the elements of another collection. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

Annotations
@SerialVersionUID()

class ZipWithIndex[A] extends AbstractView[(A, Int)]

Annotations
@SerialVersionUID()

Value Members

final def !=(arg0: Any): Boolean

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. 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

final def ==(arg0: Any): Boolean

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

def apply[A](xs: A*): View[A]

Creates a view with the specified elements.

A

the type of the view's elements

returns

a new view with elements elems

Definition Classes
ViewIterableFactory

final def asInstanceOf[T0]: 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 clone(): AnyRef

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

not specified by SLS as a member of AnyRef

def concat[A](xss: Iterable[A]*): View[A]

Concatenates all argument collections into a single collection.

xss

the collections that are to be concatenated.

returns

the concatenation of all the collections.

Definition Classes
IterableFactory

def empty[A]: View[A]

An empty collection

A

the type of the view's elements

Definition Classes
ViewIterableFactory

final def eq(arg0: AnyRef): Boolean

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. 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 fill[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(elem: => A): View[View[View[View[View[A]]]]]

Produces a five-dimensional collection containing the results of some element computation a number of times.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

n3

the number of elements in the 3rd dimension

n4

the number of elements in the 4th dimension

n5

the number of elements in the 5th dimension

elem

the element computation

returns

A collection that contains the results of n1 x n2 x n3 x n4 x n5 evaluations of elem.

Definition Classes
IterableFactory

def fill[A](n1: Int, n2: Int, n3: Int, n4: Int)(elem: => A): View[View[View[View[A]]]]

Produces a four-dimensional collection containing the results of some element computation a number of times.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

n3

the number of elements in the 3rd dimension

n4

the number of elements in the 4th dimension

elem

the element computation

returns

A collection that contains the results of n1 x n2 x n3 x n4 evaluations of elem.

Definition Classes
IterableFactory

def fill[A](n1: Int, n2: Int, n3: Int)(elem: => A): View[View[View[A]]]

Produces a three-dimensional collection containing the results of some element computation a number of times.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

n3

the number of elements in the 3rd dimension

elem

the element computation

returns

A collection that contains the results of n1 x n2 x n3 evaluations of elem.

Definition Classes
IterableFactory

def fill[A](n1: Int, n2: Int)(elem: => A): View[View[A]]

Produces a two-dimensional collection containing the results of some element computation a number of times.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

elem

the element computation

returns

A collection that contains the results of n1 x n2 evaluations of elem.

Definition Classes
IterableFactory

def fill[A](n: Int)(elem: => A): View[A]

Produces a collection containing the results of some element computation a number of times.

n

the number of elements contained in the collection.

elem

the element computation

returns

A collection that contains the results of n evaluations of elem.

Definition Classes
IterableFactory

def finalize(): Unit

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

not specified by SLS as a member of AnyRef

def from[E](it: IterableOnce[E]): View[E]

E

View element type

it

The IterableOnce to view. A proper Iterable is used directly. If it is really only IterableOnce it gets memoized on the first traversal.

returns

A view iterating over the given Iterable

Definition Classes
ViewIterableFactory

def fromIteratorProvider[A](it: () => Iterator[A]): View[A]

A

View element type

it

Function creating the iterator to be used by the view. This function must always return a fresh Iterator, otherwise the resulting view will be effectively iterable only once.

returns

A View[A] whose underlying iterator is provided by the it parameter-less function.

final def getClass(): Class[_ <: AnyRef]

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 hashCode(): Int

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()

final def isInstanceOf[T0]: Boolean

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

implicit def iterableFactory[A]: Factory[A, View[A]]

Definition Classes
IterableFactory

def iterate[A](start: A, len: Int)(f: (A) => A): View[A]

Produces a collection containing repeated applications of a function to a start value.

start

the start value of the collection

len

the number of elements contained in the collection

f

the function that's repeatedly applied

returns

a collection with len values in the sequence start, f(start), f(f(start)), ...

Definition Classes
IterableFactory

final def ne(arg0: AnyRef): Boolean

Equivalent to !(this eq that).

returns

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

Definition Classes
AnyRef

def newBuilder[A]: Builder[A, View[A]]

A

the type of the view’s elements

returns

A builder for View objects.

Definition Classes
ViewIterableFactory

final def notify(): Unit

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.

Definition Classes
AnyRef
Annotations
@native()
Note

not specified by SLS as a member of AnyRef

def range[A](start: A, end: A, step: A)(implicit arg0: Integral[A]): View[A]

Produces a collection containing equally spaced values in some integer interval.

start

the start value of the collection

end

the end value of the collection (the first value NOT contained)

step

the difference between successive elements of the collection (must be positive or negative)

returns

a collection with values start, start + step, ... up to, but excluding end

Definition Classes
IterableFactory

def range[A](start: A, end: A)(implicit arg0: Integral[A]): View[A]

Produces a collection containing a sequence of increasing of integers.

start

the first element of the collection

end

the end value of the collection (the first value NOT contained)

returns

a collection with values start, start + 1, ..., end - 1

Definition Classes
IterableFactory

final def synchronized[T0](arg0: => T0): T0

Definition Classes
AnyRef

def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int, n5: Int)(f: (Int, Int, Int, Int, Int) => A): View[View[View[View[View[A]]]]]

Produces a five-dimensional collection containing values of a given function over ranges of integer values starting from 0.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

n3

the number of elements in the 3rd dimension

n4

the number of elements in the 4th dimension

n5

the number of elements in the 5th dimension

f

The function computing element values

returns

A collection consisting of elements f(i1, i2, i3, i4, i5) for 0 <= i1 < n1, 0 <= i2 < n2, 0 <= i3 < n3, 0 <= i4 < n4, and 0 <= i5 < n5.

Definition Classes
IterableFactory

def tabulate[A](n1: Int, n2: Int, n3: Int, n4: Int)(f: (Int, Int, Int, Int) => A): View[View[View[View[A]]]]

Produces a four-dimensional collection containing values of a given function over ranges of integer values starting from 0.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

n3

the number of elements in the 3rd dimension

n4

the number of elements in the 4th dimension

f

The function computing element values

returns

A collection consisting of elements f(i1, i2, i3, i4) for 0 <= i1 < n1, 0 <= i2 < n2, 0 <= i3 < n3, and 0 <= i4 < n4.

Definition Classes
IterableFactory

def tabulate[A](n1: Int, n2: Int, n3: Int)(f: (Int, Int, Int) => A): View[View[View[A]]]

Produces a three-dimensional collection containing values of a given function over ranges of integer values starting from 0.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

n3

the number of elements in the 3rd dimension

f

The function computing element values

returns

A collection consisting of elements f(i1, i2, i3) for 0 <= i1 < n1, 0 <= i2 < n2, and 0 <= i3 < n3.

Definition Classes
IterableFactory

def tabulate[A](n1: Int, n2: Int)(f: (Int, Int) => A): View[View[A]]

Produces a two-dimensional collection containing values of a given function over ranges of integer values starting from 0.

n1

the number of elements in the 1st dimension

n2

the number of elements in the 2nd dimension

f

The function computing element values

returns

A collection consisting of elements f(i1, i2) for 0 <= i1 < n1 and 0 <= i2 < n2.

Definition Classes
IterableFactory

def tabulate[A](n: Int)(f: (Int) => A): View[A]

Produces a collection containing values of a given function over a range of integer values starting from 0.

n

The number of elements in the collection

f

The function computing element values

returns

A collection consisting of elements f(0), ..., f(n -1)

Definition Classes
IterableFactory

def toString(): String

Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

returns

a String representation of the object.

Definition Classes
AnyRef → Any

def unfold[A, S](init: S)(f: (S) => Option[(A, S)]): View[A]

Produces a collection that uses a function f to produce elements of type A and update an internal state of type S.

A

Type of the elements

S

Type of the internal state

init

State initial value

f

Computes the next element (or returns None to signal the end of the collection)

returns

a collection that produces elements using f until f returns None

Definition Classes
IterableFactory

final def wait(): Unit

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

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

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

final def wait(arg0: Long): Unit

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

object Empty extends AbstractView[Nothing] with Product with Serializable

The empty view

Annotations
@SerialVersionUID()

object Filter extends java.io.Serializable

© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.13.0/scala/collection/View$.html