bind.js

// http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind.html
if (!Function.prototype.bind) {
    Function.prototype.bind = function (oThis) {
        //return function () {};
        if (typeof this !== 'function') {
            // closest thing possible to the ECMAScript 5
            // internal IsCallable function
            throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
        }

        var aArgs = Array.prototype.slice.call(arguments, 1),
            fToBind = this,
            fNOP = function () {},
            fBound = function () {
                return fToBind.apply(this instanceof fNOP && oThis
                    ? this
                    : oThis,
                    aArgs.concat(Array.prototype.slice.call(arguments)));
            };

        // test this.prototype in case of native functions binding:
        //  - https://gist.github.com/jacomyal/4b7ae101a1cf6b985c60
        if (this.prototype)
            fNOP.prototype = this.prototype;
        fBound.prototype = new fNOP();

        return fBound;
    };
}