Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function cloneObject(object) {
      var clone = new object.constructor;
    
      for (var key in object) {
        clone[key] = object[key];
      }
    
      return clone;
    }
    
    function cloneArray1(array) {
      var clone = [];
    
      for (var i = 0; i < array.length; i++) {
        clone[i] = array[i];
      }
    
      return clone;
    }
    
    function cloneArray2(array) {
      var clone = [],
          len = array.length;
    
      for (var i = 0; i < len; i++) {
        clone[i] = array[i];
      }
    
      return clone;
    }
    
    function cloneArray3(array) {
      return array.concat();
    }
    
    function cloneArray4(array) {
      return array.slice();
    }
    
    function cloneArray5(array) {
      return array.slice(0);
    }
    
    function cloneArray6(array) {
      return array.filter(True);
    }
    
    function cloneArray7(array) {
      return array.map(Identity);
    }
    
    function cloneArray8(array) {
      return Array.apply([], array);
    }
    
    function cloneArray9(array) {
      return array.splice(0);
    }
    
    function cloneArray10(array) {
      return [].concat(array);
    }
    
    function True() {
      return true;
    }
    
    function Identity(v) {
      return v;
    }
    var array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
  };
</script>

Test runner

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cloneObject(array);

cloneArray1(array);

cloneArray2(array);

cloneArray3(array);

cloneArray4(array);

cloneArray5(array);

cloneArray6(array);

cloneArray7(array);

cloneArray8(array);

cloneArray9(array);

cloneArray10(array);

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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 Athorcis on 26th April 2012
• Revision 2: published on 7th February 2013
• Revision 3: published on 9th February 2013
• Revision 4: published on 10th February 2013
• Revision 5: published on 13th February 2013

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