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Functional patterns for Java

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package com.jnape.palatable.lambda.functions.builtin.fn2;

import com.jnape.palatable.lambda.functions.Fn1;
import com.jnape.palatable.lambda.functions.Fn2;
import com.jnape.palatable.lambda.functions.Fn3;

/**
 * Partially apply (fix) the first argument of a Fn3, producing a Fn2 that takes the remaining
 * two argument. This is isomorphic to calling {@link Fn3#apply(Object)}.
 *
 * @param  The type of the value to be supplied
 * @param  The first input argument type of the resulting function
 * @param  The second input argument type of the resulting function
 * @param  The return type of the resulting function
 * @see Partial2
 */
public final class Partial3 implements Fn2, A, Fn2> {

    private Partial3() {
    }

    @Override
    public Fn2 apply(Fn3 fn, A a) {
        return fn.apply(a);
    }

    public static  Partial3 partial3() {
        return new Partial3<>();
    }

    public static  Fn1> partial3(Fn3 fn) {
        return Partial3.partial3().apply(fn);
    }

    public static  Fn2 partial3(Fn3 fn, A a) {
        return partial3(fn).apply(a);
    }
}