Implementation of Curry, Uncurry, & Compose functions (with accompanying tests).

functional.js

/*
 * Curry takes a two argumented function and returns one func that returns a second func that each take one argument.
 */
function curry (func) {
	return function (x) {
		return function (y) {
			return func (x, y);
		};
	};
}

/*
 * Uncurry binds a curry-ed function into one that takes two arguements
 */
function uncurry (func) {
	return function (x, y) {
		return func (x) (y);
	};
}


/*
 * Compose takes two functions and composes them just as one would compose to functions in math
 */
function compose (f, g) {
	return function (x) {
		return f (g (x));
	};
}


/* 
 * Basic Tests using Chrome Dev Console 
 */
console.assert ((curry (add) (1) (2)) === 3);
console.assert ((curry (multiply) (1) (2)) === 2);
console.assert ((curry (subtract) (1) (2)) === -1);
console.assert ((curry (divide) (1) (2)) === 0.5);

console.assert (((uncurry (curry (add))) (1, 2)) === add (1, 2));
console.assert (((uncurry (curry (multiply))) (1, 2)) === multiply (1, 2));
console.assert (((uncurry (curry (subtract))) (1, 2)) === subtract (1, 2));
console.assert (((uncurry (curry (divide))) (1, 2)) === divide (1, 2));

console.assert (compose (curry (multiply) (2), curry (add) (3)) (2) === 10);
console.assert (compose (curry (multiply) (2), curry (add) (5)) (3) === 16);
console.assert (compose (curry (multiply) (2), curry (multiply) (3)) (2) === 12);
console.assert (compose (curry (multiply) (2), curry (add) (5)) (2) === 14);


/*
 * Helper tester functions
 */
var add = function (x, y) {
	return x + y;
};

var subtract = function (x, y) {
	return x - y;
};

var multiply = function (x, y) {
	return x * y;
};

var divide = function (x, y) {
	return x / y;
};