Client and backend. This class is shared: the same code is compiled into your app and into your server, so everything on this page works in both.

@FunctionalInterface

public interface Function<T, R>

Known subtypesUnaryOperator

A function of one argument.

Methods

`public abstract R apply(T t)`	Applies this function.
`public default <V>` `Function<V, R> compose(Function<? super V, ? extends T> before)`	`before`, then this function on its result.
`public default <V>` `Function<T, V> andThen(Function<? super R, ? extends V> after)`	This function, then `after` on its result.
`public static <T>` `Function<T, T> identity()`	The function that answers its argument.

public abstract R apply(T t)

Applies this function.

the result

public default <V> Function<V, R> compose(Function<? super V, ? extends T> before)

before, then this function on its result.

the composed function

public default <V> Function<T, V> andThen(Function<? super R, ? extends V> after)

This function, then after on its result.

the composed function

public static <T> Function<T, T> identity()

The function that answers its argument.

the identity function