Prototype

//The prototype object help to quickly add a custom property or method to an object that is reflected on all instances of it
        //Object must be created with the new keyword
        //example 1
        function backwards() {
            for (var i = this.length - 1; i >= 0; i--) {
                document.write(this.charAt(i));
            }
        }
        String.prototype.write = backwards;
        var test = new String("Hello man");
        test.write();
        //example2
        function dummy() {

        }
        var test = new dummy();
        function myProperty(name){
            this.name = name;
        }
        function myMethod() {
            console.log("Say something");
        }
        dummy.prototype.name = myProperty;
        dummy.prototype.method = myMethod;
        test.prop = "Pesho";
        console.log(test.prop);
        test.method();