How can I make var a = add(2)(3); //5 work?

Question

I want to make this syntax possible:

var a = add(2)(3); //5

based on what I read at http://dmitry.baranovskiy.com/post/31797647

I\

Answer 1

in addition to what's already said, here's a solution with generic currying (based on http://github.com/sstephenson/prototype/blob/master/src/lang/function.js#L180)

Function.prototype.curry = function() {
    if (!arguments.length) return this;
    var __method = this, args = [].slice.call(arguments, 0);
    return function() {
      return __method.apply(this, [].concat(
        [].slice.call(args, 0),
        [].slice.call(arguments, 0)));
   }
}


add = function(x) {
    return (function (x, y) { return x + y }).curry(x)
}

console.log(add(2)(3))