JavaScript function that binds the context of a Function, returning a new one (detects native browser support)

function-bind.js

var Bind = (function () {
    "use strict";

    var A, F, ret;

    A = [];
    F = function () { return undefined; };

    if (F.bind && !F.hasOwnProperty("bind")) {
        ret = function (func, thisArg /*, args */) {
            var finalArgs = [thisArg];
            A.push.apply(finalArgs, A.slice.call(arguments, 2));
            return F.apply.call(func.bind, func, finalArgs);
        };
    } else {
        ret = function (func, thisArg /*, args */) {
            var finalArgs = A.slice.call(arguments, 2);
            return function () {
                var copiedArgs = A.slice.call(arguments, 0);
                A.push.apply(finalArgs, copiedArgs);
                func.apply(thisArg, finalArgs);
            };
        };
    }

    return ret;
}());