(function() {

    // let's add some "evil" prototype definitions

    if(!String.prototype.contains) {
        String.prototype.contains = function(startIndex) {
            return this.indexOf(startIndex) !== -1;
        };
    }

    if(!Array.prototype.contains) {
        Array.prototype.contains = function(startIndex) {
            return this.indexOf(startIndex) !== -1;
        };
    }

    if(!Array.prototype.last) {
        Array.prototype.last = function() {
            return this[this.length - 1];
        };
    }

    if(!Array.prototype.first) {
        Array.prototype.first = function() {
            return this[0];
        };
    }

    if(!Node.prototype.wipeChildren) {
        Node.prototype.wipeChildren = function() {
            while(this.lastChild) {
                this.removeChild(this.lastChild);
            }
        };
    }

})();