F (playframework)

java.lang.Object
- play.libs.F

```
public class F
extends java.lang.Object
```
Defines a set of functional programming style helpers.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static interface`	`F.Callback<A>` A Callback with a single argument.
`static interface`	`F.Callback0` A Callback with no arguments.
`static interface`	`F.Callback2<A,B>` A Callback with 2 arguments.
`static interface`	`F.Callback3<A,B,C>` A Callback with 3 arguments.
`static class`	`F.Either<A,B>` Represents a value of one of two possible types (a disjoint union)
`static interface`	`F.Function<A,R>` A Function with a single argument.
`static interface`	`F.Function0<R>` A Function with no arguments.
`static interface`	`F.Function2<A,B,R>` A Function with 2 arguments.
`static interface`	`F.Function3<A,B,C,R>` A Function with 3 arguments.
`static class`	`F.None<T>` Represents non-existent values.
`static class`	`F.Option<T>` Represents optional values.
`static class`	`F.Promise<A>` A promise to produce a result of type `A`.
`static class`	`F.Some<T>` Represents existing values of type `T`.
`static class`	`F.Tuple<A,B>` A pair - a tuple of the types `A` and `B`.
`static class`	`F.Tuple3<A,B,C>` A tuple of A,B,C
`static class`	`F.Tuple4<A,B,C,D>` A tuple of A,B,C,D
`static class`	`F.Tuple5<A,B,C,D,E>` A tuple of A,B,C,D,E

Constructor Summary

Constructors
Constructor and Description

F()

Constructors
Constructor and Description
`F()`

Method Summary

Methods
Modifier and Type	Method and Description
`static F.None`	`None()` Constructs a `None` value.
`static <A> F.Some<A>`	`Some(A value)` Construct a `Some` value.
`static <A,B> F.Tuple<A,B>`	`Tuple(A a, B b)` Constructs a tuple of A,B
`static <A,B,C> F.Tuple3<A,B,C>`	`Tuple3(A a, B b, C c)` Constructs a tuple of A,B,C
`static <A,B,C,D> F.Tuple4<A,B,C,D>`	`Tuple4(A a, B b, C c, D d)` Constructs a tuple of A,B,C,D
`static <A,B,C,D,E> F.Tuple5<A,B,C,D,E>`	`Tuple5(A a, B b, C c, D d, E e)` Constructs a tuple of A,B,C,D,E

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

Constructor Detail
- F
```
public F()
```

Method Detail

Some
```
public static <A> F.Some<A> Some(A value)
```
Construct a Some value.

Parameters:
value - The value

Returns:
Some value.

None
```
public static F.None None()
```
Constructs a None value.

Returns:
None.

Tuple
```
public static <A,B> F.Tuple<A,B> Tuple(A a,
                       B b)
```
Constructs a tuple of A,B

Parameters:
a - The a value
b - The b value

Returns:
The tuple

Tuple3

public static <A,B,C> F.Tuple3<A,B,C> Tuple3(A a,
                             B b,
                             C c)

Constructs a tuple of A,B,C

Parameters:: a - The a value; b - The b value; c - The c value
Returns:: The tuple

Tuple4

public static <A,B,C,D> F.Tuple4<A,B,C,D> Tuple4(A a,
                                 B b,
                                 C c,
                                 D d)

Constructs a tuple of A,B,C,D

Parameters:: a - The a value; b - The b value; c - The c value; d - The d value
Returns:: The tuple

Tuple5

public static <A,B,C,D,E> F.Tuple5<A,B,C,D,E> Tuple5(A a,
                                     B b,
                                     C c,
                                     D d,
                                     E e)

Constructs a tuple of A,B,C,D,E

Parameters:: a - The a value; b - The b value; c - The c value; d - The d value; e - The e value
Returns:: The tuple

Class F

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

F

Method Detail

Some

None

Tuple

Tuple3

Tuple4

Tuple5