cloning an object (v2)

Revision 2 of this benchmark created by usr on

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

Setup

var oldObject = {
     a: 1,
     b: 2,
     c: 3,
     d: 4,
     e: 5,
     f: function() {
      return 6;
     },
     g: [7, 8, 9]
    };
    
    
    function clone(obj) {
     var target = {};
     for (var i in obj) {
      if (obj.hasOwnProperty(i)) {
       target[i] = obj[i];
      }
     }
     return target;
    }
    
    Object.defineProperties(Object, {
     'extend': {
      'configurable': true,
      'enumerable': false,
      'value': function extend(what, wit) {
       var extObj, witKeys = Object.keys(wit);
    
       extObj = Object.keys(what).length ? Object.clone(what) : {};
    
       witKeys.forEach(function(key) {
        Object.defineProperty(extObj, key, Object.getOwnPropertyDescriptor(wit, key));
       });
    
       return extObj;
      },
      'writable': true
     },
     'clone': {
      'configurable': true,
      'enumerable': false,
      'value': function clone(obj) {
       return Object.extend({}, obj);
      },
      'writable': true
     }
    });

Test runner

Ready to run.

Testing in
TestOps/sec
JSON stringify/parse
var newObject = JSON.parse(JSON.stringify(oldObject));
ready
jQuery.extend() deep
var newObject = jQuery.extend(true, {}, oldObject);
ready
jQuery.extend()
var newObject = jQuery.extend({}, oldObject);
ready
clone function
var newObject = clone(oldObject);
ready
ES5 Object.clone
var newObject = Object.clone(oldObject);
ready
stringify eval
var newObject = eval("("+JSON.stringify(oldObject)+")");
ready

Revisions

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