better object cloning in javascript

how_to_clone_in_javascript.markdown

A more complete solution relies on ECMAScript 5 and uses definition instead of assignment:

  function update(target) {
        var sources = [].slice.call(arguments, 1);
        sources.forEach(function (source) {
            Object.getOwnPropertyNames(source).forEach(function(propName) {
                Object.defineProperty(target, propName,
                    Object.getOwnPropertyDescriptor(source, propName));
            });
        });
        return target;
    };

We have also used ECMAScript 5 functions instead of Underscore functions. The above function is therefore completely independent of that library. update gives you a simple way to clone an object:

function clone(obj) {
        var copy = Object.create(Object.getPrototypeOf(obj));
        update(copy, obj);
        return copy;
    }