Array (core 4.6 API)

java.lang.Object
- fj.data.Array<A>

All Implemented Interfaces:: java.lang.Iterable<A>

public final class Array<A>
extends java.lang.Object
implements java.lang.Iterable<A>

Provides an interface to arrays.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Array.ImmutableProjection<A>
Projects an array by providing only operations which do not mutate.

Nested Classes
Modifier and Type	Class and Description
`static class`	`Array.ImmutableProjection<A>` Projects an array by providing only operations which do not mutate.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`Array<A>`	`append(Array<A> aas)` Appends the given array to this array.
`<B> Array<B>`	`apply(Array<F<A,B>> lf)` Performs function application within an array (applicative functor pattern).
`java.lang.Object[]`	`array()` Returns a copy of the underlying primitive array.
`static <A> Array<A>`	`array(A... as)` Constructs an array from the given elements.
`A[]`	`array(java.lang.Class<A[]> c)` Returns a copy of the underlying primitive array.
`static <A> Array<A>`	`arrayArray(A... as)` Returns a copy of the underlying primitive array.
`java.util.List<A>`	`asJavaList()` Projects an unmodifiable list view of this array.
`<B,C> Array<C>`	`bind(Array<B> sb, F<A,F<B,C>> f)` Binds the given function across each element of this array and the given array with a final join.
`<B,C> Array<C>`	`bind(Array<B> sb, F2<A,B,C> f)` Binds the given function across each element of this array and the given array with a final join.
`<B> Array<B>`	`bind(F<A,Array<B>> f)` Binds the given function across each element of this array with a final join.
`static <T> T[]`	`copyOf(T[] a, int len)`
`static <T,U> T[]`	`copyOf(U[] a, int len, java.lang.Class<? extends T[]> newType)`
`static char[]`	`copyOfRange(char[] a, int from, int to)`
`static <A> Array<A>`	`empty()` Returns an empty array.
`boolean`	`equals(java.lang.Object o)`
`boolean`	`exists(F<A,java.lang.Boolean> f)` Returns `true` if the predicate holds for at least one of the elements of this array, `false` otherwise (`false` for the empty array).
`Array<A>`	`filter(F<A,java.lang.Boolean> f)` Filters elements from this array by returning only elements which produce `true` when the given function is applied to them.
`Option<A>`	`find(F<A,java.lang.Boolean> f)` Finds the first occurrence of an element that matches the given predicate or no value if no elements match.
`<B> B`	`foldLeft(F<B,F<A,B>> f, B b)` Performs a left-fold reduction across this array.
`<B> B`	`foldLeft(F2<B,A,B> f, B b)` Performs a left-fold reduction across this array.
`<B> B`	`foldRight(F<A,F<B,B>> f, B b)` Performs a right-fold reduction across this array.
`<B> B`	`foldRight(F2<A,B,B> f, B b)` Performs a right-fold reduction across this array.
`boolean`	`forall(F<A,java.lang.Boolean> f)` Returns `true` if the predicate holds for all of the elements of this array, `false` otherwise (`true` for the empty array).
`Unit`	`foreach(F<A,Unit> f)` Performs a side-effect for each element of this array.
`void`	`foreachDoEffect(Effect1<A> f)` Performs a side-effect for each element of this array.
`A`	`get(int index)` Returns the element at the given index if it exists, fails otherwise.
`int`	`hashCode()`
`Array.ImmutableProjection<A>`	`immutable()`
`boolean`	`isEmpty()` Returns `true` is this array is empty, `false` otherwise.
`boolean`	`isNotEmpty()` Returns `false` is this array is empty, `true` otherwise.
`static <A> Array<A>`	`iterableArray(java.lang.Iterable<A> i)` Takes the given iterable to an array.
`java.util.Iterator<A>`	`iterator()` Returns an iterator for this array.
`static <A> Array<A>`	`iteratorArray(java.util.Iterator<A> i)` Creates an Array from the iterator.
`static <A> F<Array<Array<A>>,Array<A>>`	`join()` A first-class version of join
`static <A> Array<A>`	`join(Array<Array<A>> o)` Joins the given array of arrays using a bind operation.
`int`	`length()` Returns the length of this array.
`static <A,B> F<F<A,B>,F<Array<A>,Array<B>>>`	`map()` First-class map function for Arrays.
`<B> Array<B>`	`map(F<A,B> f)` Maps the given function across this array.
`static Array<java.lang.Integer>`	`range(int from, int to)` Returns an array of integers from the given `from` value (inclusive) to the given `to` value (exclusive).
`Array<A>`	`reverse()` Reverse this array in constant stack space.
`<B> Array<B>`	`scanLeft(F<B,F<A,B>> f, B b)` Performs a fold left accummulating and returns an array of the intermediate results.
`<B> Array<B>`	`scanLeft(F2<B,A,B> f, B b)` Performs a left-fold accummulating and returns an array of the intermediate results.
`Array<A>`	`scanLeft1(F<A,F<A,A>> f)` Performs a left-fold accummulating using first array element as a starting value and returns an array of the intermediate results.
`Array<A>`	`scanLeft1(F2<A,A,A> f)` Performs a left-fold accummulating using first array element as a starting value and returns an array of the intermediate results.
`<B> Array<B>`	`scanRight(F<A,F<B,B>> f, B b)` Performs a right-fold accummulating and returns an array of the intermediate results.
`<B> Array<B>`	`scanRight(F2<A,B,B> f, B b)` Performs a right-fold accummulating and returns an array of the intermediate results.
`Array<A>`	`scanRight1(F<A,F<A,A>> f)` Performs a right-fold accummulating using last array element as a starting value and returns an array of the intermediate results.
`Array<A>`	`scanRight1(F2<A,A,A> f)` Performs a right-fold accummulating using last array element as a starting value and returns an array of the intermediate results.
`<B> Array<B>`	`sequence(Array<B> bs)` Performs a bind across each array element, but ignores the element value each time.
`Unit`	`set(int index, A a)` Sets the element at the given index to the given value.
`static <A> Array<A>`	`single(A a)` Constructs a singleton array.
`java.util.Collection<A>`	`toCollection()` Projects an immutable collection of this array.
`<X> Either<X,A>`	`toEither(F0<X> x)` Returns an either projection of this array; the given argument in `Left` if empty, or the first element in `Right`.
`A[]`	`toJavaArray()` Deprecated. As of release 4.6, use `array(Class)`.
`java.util.ArrayList<A>`	`toJavaList()` Returns a java.util.ArrayList projection of this array.
`List<A>`	`toList()` Returns a list projection of this array.
`Option<A>`	`toOption()` Returns an option projection of this array; `None` if empty, or the first element in `Some`.
`Stream<A>`	`toStream()` Returns a stream projection of this array.
`java.lang.String`	`toString()`
`static <A,B> P2<Array<A>,Array<B>>`	`unzip(Array<P2<A,B>> xs)` Transforms an array of pairs into an array of first components and an array of second components.
`static <A> F<A[],Array<A>>`	`wrap()` First-class wrapper function for arrays.
`<B> Array<P2<A,B>>`	`zip(Array<B> bs)` Zips this array with the given array to produce an array of pairs.
`Array<P2<A,java.lang.Integer>>`	`zipIndex()` Zips this array with the index of its element as a pair.
`<B,C> Array<C>`	`zipWith(Array<B> bs, F<A,F<B,C>> f)` Zips this array with the given array using the given function to produce a new array.
`<B,C> Array<C>`	`zipWith(Array<B> bs, F2<A,B,C> f)` Zips this array with the given array using the given function to produce a new array.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Iterable
forEach, spliterator

- Method Detail
 - iterator
```
public java.util.Iterator<A> iterator()
```
 Returns an iterator for this array. This method exists to permit the use in a for-each loop.
 
 Specified by:
 
 iterator in interface java.lang.Iterable<A>
 
 Returns:
 
 A iterator for this array.
 - get
```
public A get(int index)
```
 Returns the element at the given index if it exists, fails otherwise.
 
 Parameters:
 
 index - The index at which to get the element to return.
 
 Returns:
 
 The element at the given index if it exists, fails otherwise.
 - hashCode
```
public int hashCode()
```
 Overrides:
 
 hashCode in class java.lang.Object
 - set
```
public Unit set(int index,
 A a)
```
 Sets the element at the given index to the given value.
 
 Parameters:
 
 index - The index at which to set the given value.
 
 a - The value to set at the given index.
 
 Returns:
 
 The unit value.
 - length
```
public int length()
```
 Returns the length of this array.
 
 Returns:
 
 The length of this array.
 - immutable
```
public Array.ImmutableProjection<A> immutable()
```
 - isEmpty
```
public boolean isEmpty()
```
 Returns true is this array is empty, false otherwise.
 
 Returns:
 
 true is this array is empty, false otherwise.
 - isNotEmpty
```
public boolean isNotEmpty()
```
 Returns false is this array is empty, true otherwise.
 
 Returns:
 
 false is this array is empty, true otherwise.
 - array
```
public A[] array(java.lang.Class<A[]> c)
```
 Returns a copy of the underlying primitive array.
 
 Parameters:
 
 c - A class for the returned array.
 
 Returns:
 
 A copy of the underlying primitive array.
 - array
```
public java.lang.Object[] array()
```
 Returns a copy of the underlying primitive array.
 
 Returns:
 
 A copy of the underlying primitive array;
 - toJavaArray
```
@Deprecated
public A[] toJavaArray()
```
 Deprecated. As of release 4.6, use array(Class).
 
 To be removed in future release: affectation of the result of this method to a non generic array will result in runtime error (ClassCastException).
 - toOption
```
public Option<A> toOption()
```
 Returns an option projection of this array; None if empty, or the first element in Some.
 
 Returns:
 
 An option projection of this array.
 - toEither
```
public <X> Either<X,A> toEither(F0<X> x)
```
 Returns an either projection of this array; the given argument in Left if empty, or the first element in Right.
 
 Parameters:
 
 x - The value to return in left if this array is empty.
 
 Returns:
 
 An either projection of this array.
 - toList
```
public List<A> toList()
```
 Returns a list projection of this array.
 
 Returns:
 
 A list projection of this array.
 - toStream
```
public Stream<A> toStream()
```
 Returns a stream projection of this array.
 
 Returns:
 
 A stream projection of this array.
 - toString
```
public java.lang.String toString()
```
 Overrides:
 
 toString in class java.lang.Object
 - map
```
public  Array map(F<A,B> f)
```
 Maps the given function across this array.
 
 Parameters:
 
 f - The function to map across this array.
 
 Returns:
 
 A new array after the given function has been applied to each element.
 - filter
```
public Array<A> filter(F<A,java.lang.Boolean> f)
```
 Filters elements from this array by returning only elements which produce true when the given function is applied to them.
 
 Parameters:
 
 f - The predicate function to filter on.
 
 Returns:
 
 A new array whose elements all match the given predicate.
 - foreach
```
public Unit foreach(F<A,Unit> f)
```
 Performs a side-effect for each element of this array.
 
 Parameters:
 
 f - The side-effect to perform for the given element.
 
 Returns:
 
 The unit value.
 - foreachDoEffect
```
public void foreachDoEffect(Effect1<A> f)
```
 Performs a side-effect for each element of this array.
 
 Parameters:
 
 f - The side-effect to perform for the given element.
 - foldRight
```
public  B foldRight(F<A,F<B,B>> f,
 B b)
```
 Performs a right-fold reduction across this array. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each element of the array.
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The final result after the right-fold reduction.
 - foldRight
```
public  B foldRight(F2<A,B,B> f,
 B b)
```
 Performs a right-fold reduction across this array. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each element of the array.
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The final result after the right-fold reduction.
 - foldLeft
```
public  B foldLeft(F<B,F<A,B>> f,
 B b)
```
 Performs a left-fold reduction across this array. This function runs in constant space.
 
 Parameters:
 
 f - The function to apply on each element of the array.
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The final result after the left-fold reduction.
 - foldLeft
```
public  B foldLeft(F2<B,A,B> f,
 B b)
```
 Performs a left-fold reduction across this array. This function runs in constant space.
 
 Parameters:
 
 f - The function to apply on each element of the array.
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The final result after the left-fold reduction.
 - scanLeft
```
public  Array scanLeft(F<B,F<A,B>> f,
 B b)
```
 Performs a fold left accummulating and returns an array of the intermediate results. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (initial value/previous result and next array element)
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The array containing all intermediate results of the left-fold reduction.
 - scanLeft
```
public  Array scanLeft(F2<B,A,B> f,
 B b)
```
 Performs a left-fold accummulating and returns an array of the intermediate results. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (initial value/previous result and next array element)
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The array containing all intermediate results of the left-fold reduction.
 - scanLeft1
```
public Array<A> scanLeft1(F<A,F<A,A>> f)
```
 Performs a left-fold accummulating using first array element as a starting value and returns an array of the intermediate results. It will fail for empty arrays. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (next array element and first array element/previous result)
 
 Returns:
 
 The array containing all intermediate results of the left-fold reduction.
 - scanLeft1
```
public Array<A> scanLeft1(F2<A,A,A> f)
```
 Performs a left-fold accummulating using first array element as a starting value and returns an array of the intermediate results. It will fail for empty arrays. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (next array element and first array element/previous result)
 
 Returns:
 
 The array containing all intermediate results of the left-fold reduction.
 - scanRight
```
public  Array scanRight(F<A,F<B,B>> f,
 B b)
```
 Performs a right-fold accummulating and returns an array of the intermediate results. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (previous array element and initial value/previous result)
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The array containing all intermediate results of the right-fold reduction.
 - scanRight
```
public  Array scanRight(F2<A,B,B> f,
 B b)
```
 Performs a right-fold accummulating and returns an array of the intermediate results. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (previous array element and initial value/previous result)
 
 b - The beginning value to start the application from.
 
 Returns:
 
 The array containing all intermediate results of the right-fold reduction.
 - scanRight1
```
public Array<A> scanRight1(F<A,F<A,A>> f)
```
 Performs a right-fold accummulating using last array element as a starting value and returns an array of the intermediate results. It will fail for empty arrays. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (previous array element and last array element/previous result)
 
 Returns:
 
 The array containing all intermediate results of the right-fold reduction.
 - scanRight1
```
public Array<A> scanRight1(F2<A,A,A> f)
```
 Performs a right-fold accummulating using last array element as a starting value and returns an array of the intermediate results. It will fail for empty arrays. This function runs in constant stack space.
 
 Parameters:
 
 f - The function to apply on each argument pair (previous array element and last array element/previous result)
 
 Returns:
 
 The array containing all intermediate results of the right-fold reduction.
 - bind
```
public  Array bind(F<A,Array> f)
```
 Binds the given function across each element of this array with a final join.
 
 Parameters:
 
 f - The function to apply to each element of this array.
 
 Returns:
 
 A new array after performing the map, then final join.
 - sequence
```
public  Array sequence(Array bs)
```
 Performs a bind across each array element, but ignores the element value each time.
 
 Parameters:
 
 bs - The array to apply in the final join.
 
 Returns:
 
 A new array after the final join.
 - bind
```
public <B,C> Array<C> bind(Array sb,
 F<A,F<B,C>> f)
```
 Binds the given function across each element of this array and the given array with a final join.
 
 Parameters:
 
 sb - A given array to bind the given function with.
 
 f - The function to apply to each element of this array and the given array.
 
 Returns:
 
 A new array after performing the map, then final join.
 - bind
```
public <B,C> Array<C> bind(Array sb,
 F2<A,B,C> f)
```
 Binds the given function across each element of this array and the given array with a final join.
 
 Parameters:
 
 sb - A given array to bind the given function with.
 
 f - The function to apply to each element of this array and the given array.
 
 Returns:
 
 A new array after performing the map, then final join.
 - apply
```
public  Array apply(Array<F<A,B>> lf)
```
 Performs function application within an array (applicative functor pattern).
 
 Parameters:
 
 lf - The array of functions to apply.
 
 Returns:
 
 A new array after applying the given array of functions through this array.
 - reverse
```
public Array<A> reverse()
```
 Reverse this array in constant stack space.
 
 Returns:
 
 A new array that is the reverse of this one.
 - append
```
public Array<A> append(Array<A> aas)
```
 Appends the given array to this array.
 
 Parameters:
 
 aas - The array to append to this one.
 
 Returns:
 
 A new array that has appended the given array.
 - empty
```
public static <A> Array<A> empty()
```
 Returns an empty array.
 
 Returns:
 
 An empty array.
 - array
```
@SafeVarargs
public static <A> Array<A> array(A... as)
```
 Constructs an array from the given elements.
 
 Parameters:
 
 as - The elements to construct the array with.
 
 Returns:
 
 A new array of the given elements.
 - single
```
public static <A> Array<A> single(A a)
```
 Constructs a singleton array.
 
 Parameters:
 
 a - The element to put in the array.
 
 Returns:
 
 An array with the given single element.
 - wrap
```
public static <A> F<A[],Array<A>> wrap()
```
 First-class wrapper function for arrays.
 
 Returns:
 
 A function that wraps a given array.
 - map
```
public static <A,B> F<F<A,B>,F<Array<A>,Array>> map()
```
 First-class map function for Arrays.
 
 Returns:
 
 A function that maps a given function across a given array.
 - join
```
public static <A> Array<A> join(Array<Array<A>> o)
```
 Joins the given array of arrays using a bind operation.
 
 Parameters:
 
 o - The array of arrays to join.
 
 Returns:
 
 A new array that is the join of the given arrays.
 - join
```
public static <A> F<Array<Array<A>>,Array<A>> join()
```
 A first-class version of join
 
 Returns:
 
 A function that joins a array of arrays using a bind operation.
 - forall
```
public boolean forall(F<A,java.lang.Boolean> f)
```
 Returns true if the predicate holds for all of the elements of this array, false otherwise (true for the empty array).
 
 Parameters:
 
 f - the predicate function to test on each element of this array.
 
 Returns:
 
 true if the predicate holds for all of the elements of this array, false otherwise.
 - exists
```
public boolean exists(F<A,java.lang.Boolean> f)
```
 Returns true if the predicate holds for at least one of the elements of this array, false otherwise (false for the empty array).
 
 Parameters:
 
 f - the predicate function to test on the elements of this array.
 
 Returns:
 
 true if the predicate holds for at least one of the elements of this array.
 - equals
```
public boolean equals(java.lang.Object o)
```
 Overrides:
 
 equals in class java.lang.Object
 - find
```
public Option<A> find(F<A,java.lang.Boolean> f)
```
 Finds the first occurrence of an element that matches the given predicate or no value if no elements match.
 
 Parameters:
 
 f - The predicate function to test on elements of this array.
 
 Returns:
 
 The first occurrence of an element that matches the given predicate or no value if no elements match.
 - range
```
public static Array<java.lang.Integer> range(int from,
 int to)
```
 Returns an array of integers from the given from value (inclusive) to the given to value (exclusive).
 
 Parameters:
 
 from - The minimum value for the array (inclusive).
 
 to - The maximum value for the array (exclusive).
 
 Returns:
 
 An array of integers from the given from value (inclusive) to the given to value (exclusive).
 - zipWith
```
public <B,C> Array<C> zipWith(Array bs,
 F<A,F<B,C>> f)
```
 Zips this array with the given array using the given function to produce a new array. If this array and the given array have different lengths, then the longer array is normalised so this function never fails.
 
 Parameters:
 
 bs - The array to zip this array with.
 
 f - The function to zip this array and the given array with.
 
 Returns:
 
 A new array with a length the same as the shortest of this array and the given array.
 - zipWith
```
public <B,C> Array<C> zipWith(Array bs,
 F2<A,B,C> f)
```
 Zips this array with the given array using the given function to produce a new array. If this array and the given array have different lengths, then the longer array is normalised so this function never fails.
 
 Parameters:
 
 bs - The array to zip this array with.
 
 f - The function to zip this array and the given array with.
 
 Returns:
 
 A new array with a length the same as the shortest of this array and the given array.
 - zip
```
public  Array<P2<A,B>> zip(Array bs)
```
 Zips this array with the given array to produce an array of pairs. If this array and the given array have different lengths, then the longer array is normalised so this function never fails.
 
 Parameters:
 
 bs - The array to zip this array with.
 
 Returns:
 
 A new array with a length the same as the shortest of this array and the given array.
 - zipIndex
```
public Array<P2<A,java.lang.Integer>> zipIndex()
```
 Zips this array with the index of its element as a pair.
 
 Returns:
 
 A new array with the same length as this array.
 - toCollection
```
public java.util.Collection<A> toCollection()
```
 Projects an immutable collection of this array.
 
 Returns:
 
 An immutable collection of this array.
 - asJavaList
```
public java.util.List<A> asJavaList()
```
 Projects an unmodifiable list view of this array.
 
 Returns:
 
 An unmodifiable list view of this array.
 - toJavaList
```
public java.util.ArrayList<A> toJavaList()
```
 Returns a java.util.ArrayList projection of this array.
 - iterableArray
```
public static <A> Array<A> iterableArray(java.lang.Iterable<A> i)
```
 Takes the given iterable to an array.
 
 Parameters:
 
 i - The iterable to take to an array.
 
 Returns:
 
 An array from the given iterable.
 - iteratorArray
```
public static <A> Array<A> iteratorArray(java.util.Iterator<A> i)
```
 Creates an Array from the iterator.
 - arrayArray
```
@SafeVarargs
public static <A> Array<A> arrayArray(A... as)
```
 Returns a copy of the underlying primitive array. Equivalent to array(A...)
 
 Returns:
 
 A copy of the underlying primitive array.
 - unzip
```
public static <A,B> P2<Array<A>,Array> unzip(Array<P2<A,B>> xs)
```
 Transforms an array of pairs into an array of first components and an array of second components.
 
 Parameters:
 
 xs - The array of pairs to transform.
 
 Returns:
 
 An array of first components and an array of second components.
 - copyOf
```
public static <T,U> T[] copyOf(U[] a,
 int len,
 java.lang.Class<? extends T[]> newType)
```
 - copyOf
```
public static <T> T[] copyOf(T[] a,
 int len)
```
 - copyOfRange
```
public static char[] copyOfRange(char[] a,
 int from,
 int to)
```

Class Array<A>

Nested Class Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.lang.Iterable

Method Detail

iterator

get

hashCode

set

length

immutable

isEmpty

isNotEmpty

array

array

toJavaArray

toOption

toEither

toList

toStream

toString

map

filter

foreach

foreachDoEffect

foldRight

foldRight

foldLeft

foldLeft

scanLeft

scanLeft

scanLeft1

scanLeft1

scanRight

scanRight

scanRight1

scanRight1

bind

sequence

bind

bind

apply

reverse

append

empty

array

single

wrap

map

join

join

forall

exists

equals

find

range

zipWith

zipWith

zip

zipIndex

toCollection

asJavaList

toJavaList

iterableArray

iteratorArray

arrayArray

unzip

copyOf

copyOf

copyOfRange