BindAll from underscore that allows 1 argument to bind all the functions from the prototype, or if there are more arguments they will be the only binded

bindAll.js

 //bindAll from underscore that allows 1 argument to bind all the functions from the prototype, 
 //or if there are more arguments they will be the only binded
 _.originalBindAll = _.bindAll;
_.bindAll = function (that) {
    var funcs = Array.prototype.slice.call(arguments, 1),
        validKeys = [], fn;
    if (funcs.length == 0) {
        for (var i in that) {
            fn = that[i];
            if (fn && typeof fn == "function" && (!fn.prototype || _.keys(fn.prototype).length == 0))
                validKeys.push(i);
        }
        _.originalBindAll.apply(_, [that].concat(validKeys));
    }
    else
        _.originalBindAll.apply(_, arguments);
};