Function bind polyfill

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A polyfill function for ES5 Function.prototype.bind:

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if (!Function.prototype.bind) {
  Function.prototype.bind = function (obj) {
    var slice = [].slice;
    var args = slice.call(arguments, 1);
    var self = this;
    var nop = function () {};
    var bound = function () {
      return self.apply(
        this.instanceof nop ? this : (obj || {}),
        args.concat(slice.call(arguments))
      );
    
    nop.prototype = self.prototype;
    bound.prototype = new nop();
    
    return bound;
  };
}
// fn.bind(obj}) => obj.bound => obj.bound(args)
// Ctrl.bind(new Ctrl())
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