Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    Object.deepCopy = function(obj) {
      if (typeof obj !== "object") return obj;
    
      var newObj = (obj instanceof Array) ? [] : {};
      for (i in obj) {
        if (obj[i] && typeof obj[i] == "object") newObj[i] = Object.clone(obj[i]);
        else newObj[i] = obj[i];
      }
      return newObj;
    };
  };
</script>

Test runner

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Java applet disabled.

var a = [1, 2, 3];
var b = a.slice(0);

var a = [1, 2, 3];
var b = a.splice(0);

var a = [1, 2, 3];
var b = a.concat();

var a = [1, 2, 3];
var b = eval(JSON.stringify(a));

var a = [1, 2, 3];
var b = Object.deepCopy(a);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by JiangXiaoQiang on 16th January 2013
• Revision 2: published by Luis Cantero on 4th February 2013

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