Curry.js

function curry(fn) {
	var slice = Array.prototype.slice,
		stored_args = slice.call(arguments, 1);

	return function() {
		var new_args = slice.call(arguments),
			args = stored_args.concat(new_args);
			return fn.apply(null, args);
  }
}

function add(x, y) {
	return x + y;
}

console.log(curry(add, 5)(7));