Clones an object or an array Returns Object or Array Makes a deep copy of the specified object or the array. Similar to Object.assign, except it makes a deep copy. If you pass an array is specified, it will return array. If you pass an object, it will return an object. var a = { c: 1, d: 2, k: { k1: 1, k2: 2 } } var b = w2utils.clonse(a); // change a deep key a.k.k1 = 5; console.log(a.k.k1, b.k.k1);