Bind function to this OR bind this to function ?!

bind.js

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

var bind = function (func, thisArg) {
  return function () {
    return func.apply(thisArg, arguments);
  };
};

var bind2 = function (func, thisArg) {
  var applied = func.apply.curry(thisArg);
  return function () {
    applied.apply(func, arguments);
  };
};

var add = function (x, y) { return x+y; }
add(1, 2);

equals to

add.apply.apply(add, [null, [1,2]]);