bind2

bind2.js

/**
 * This function is similar to bind, but the received value of "this"
 * gets passed as the first function argument.
 */
function bind2 (fn, _this) {
  return function() {
    var args = [].slice.call(arguments);
    args.unshift(this);
    fn.apply(_this, args);
  }
}

var f = bind2(function(that, x, y, z) {
  this.doSomethingWith(that);
}, this);