Java 8 function that always return the same value without regarding to parameter

Question

Is there a predefined Function in Java 8 that does something like this:

static  Function constant(R val) {
    return (T t) -> {
          


        

Answer 1

A simple lambda, x -> val seems to be equivalent to your method;

Function<Integer, Integer> test1 = constant(5);
Function<Integer, Integer> test2 = x -> 5;

...both ignore the input and output the constant 5 when applied;

> System.out.println(test1.apply(2));
5
> System.out.println(test2.apply(2));
5