Override Method in Javascript

overrideMethodJavascript

function addMethod(object, name, fn) {
	var old = object[name];
	object[name] = function () {
		if (fn.length == arguments.length) {
			return fn.apply(this, arguments);
		} else if (typeof old == 'function') {
			return old.apply(this, arguments);
		}
	}
}

var objeto = {
  values: ['Camila', 'Viviane', 'Zacca'],
  find : function(){return 'default';}
}

addMethod(objeto, 'find', function(){return this.values;});
addMethod(objeto, 'find', function(name){return this.values + name;});