[Functional Snippet] Multi-Consumers

[Botre]

Inspired by: https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html

 

The functional package does provide a Consumer (1 arg) and a BiConsumer (2args) but you're on your own if you want more args. I stopped at 5 because I have never really needed more than that.

 

Example

    public static void main(String[] args) {
        Consumer.One<String> printInput = input -> System.out.println(input);
        Consumer.Two<Integer, Double> printSum = (a, b) -> System.out.println(a + b);
        //...
        Consumer.Five<Integer, Integer, Integer, Integer, Integer> printMultiplication = (a, b, c, d, e) ->System.out.println(a * b * c * d *e);
    }

Consumers

/**
 * Represents an operation that accepts one or multiple arguments and returns no result.
 *
 * Created by Botre on 24/05/2016.
 */
public final class Consumer {

    private Consumer() {

    }

    private interface IConsumer {
   
    }

    @FunctionalInterface
    public interface One<A> extends IConsumer {

        void consume(final A a);

    }

    @FunctionalInterface
    public interface Two<A, B> extends IConsumer {

        void consume(final A a, final B b);

    }

    @FunctionalInterface
    public interface Three<A, B, C> extends IConsumer {

        void consume(final A a, final B b, final C c);

    }

    @FunctionalInterface
    public interface Four<A, B, C, D> extends IConsumer {

        void consume(final A a, final B b, final C c, final D d);

    }

    @FunctionalInterface
    public interface Five<A, B, C, D, E> extends IConsumer {

        void consume(final A a, final B b, final C c, final D d, final E e);

    }

}

[Prozen]

Sexy, thanks.

[Gangsta Homie]

lol do u know what curried functions are

[Botre]

lol do u know what curried functions are

 

Java doesn't have variadic generics.

These are multi-type consumers.

[Gangsta Homie]

Java doesn't have variadic generics.

These are multi-type consumers.

o true

why do u finalize params? final on locals is useless, maybe for clarity but in this case its just an interface method

Edited June 24, 2016 by Gangsta Homie

[Botre]

o true

why do u finalize params? final on locals is useless, maybe for clarity but in this case its just an interface method

 

In my opinion, it's safer to finalize everything by default as opposed to leaving everything virtual by default.

 

I prefer to selectively unlock doors instead of selectively locking them, I'm an eternal pessimist who's afraid of getting robbed.