Kata

You probably know about Function.prototype.bind method in JavaScript. It returns a copy of the original function but this function will always be called in the specified context. The problem is that you can't rebind another context any more.

var func = function () {
  return this.prop;
};
var obj1 = {prop: 1},
    obj2 = {prop: 2};
    
func = func.bind(obj1);
func(); // Will produce 1

func = func.bind(obj2);
func(); // Will also produce 1 :(

Your task is override the native Function.prototype.bind method by a new one that will allow you to rebind context multiple times. In this kata you don't need to worry about currying, testing function will never get params.