Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var obj = {
      a: 1,
      b: 2,
      c: 3,
      d: 4,
      f: 5
    },
    hasOwnProperty = Object.prototype.hasOwnProperty,
    keys = Object.keys(obj);
    
    function forInIf(obj) { 
      var key, value;
      for (key in obj) {
        if (hasOwnProperty.call(obj, key)) {
          value = obj[key];
        }
      }
    }
    
    function forInNotHasTrue(obj) { 
      var key, value;
      for (key in obj) {
        if (!hasOwnProperty.call(obj, key)) { 
          continue;
        } else {
          value = obj[key];
        }
      }
    }
    
    function objectKeysForEach(obj) { 
      Object.keys(obj).forEach(withKey);
    }
    
    function keysForEach(keys) { 
      keys.forEach(withKey);
    }
    
    function forLoop(obj) { 
      var key, value;
      for (var keys = Object.keys(obj), i = 0, j = keys.length; i < j; i++) {
        key = keys[i];
        value = obj[key];
      }
    }
    
    function each(obj, fn) {
      var key;
      for (key in obj) {
        if (hasOwnProperty.call(obj, key)){
          fn.call(obj, obj[key])
        }
      }
    }
    
    function forInIfEquals(obj) {
      var key, value;
      for (key in obj) {
        if (hasOwnProperty.call(obj, key) === true) {
          value = obj[key];
        }
      }
    }
    
    function forInHasNotTrue(obj) { 
      for (key in obj) {
        if (hasOwnProperty.call(obj, key) !== true) { 
          continue;
        } else {
          value = obj[key];
        }
      }
    }
    
    function withKey(key) {
       value = obj[key];
    }
    
    function withValue(value) {
       return value;
    }
  };
</script>

Test runner

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forInIf(obj);

forInNotHasTrue(obj);

objectKeysForEach(obj);

keysForEach(keys);

forLoop(obj);

each(obj, withValue);

forInIfEquals(obj);
 

forInHasNotTrue(obj);

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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 everywhile on 26th December 2012
• Revision 2: published by Jonathan Perry on 26th December 2012
• Revision 3: published by Jean Carlo Emer on 27th December 2012
• Revision 4: published by Jonathan Perry on 29th December 2012

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