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've got no clue how to make it possible.

Answer 1

You need add to be a function that takes an argument and returns a function that takes an argument that adds the argument to add and itself.

var add = function(x) {     return function(y) { return x + y; }; }