hasOwnProperty vs !!

JavaScript performance comparison

Test case created by Benny

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var bar = function(tag, atr) {
      return !document.createElement(tag)[atr]
      }
      
      
      
      
  var baz = function(tag, atr) {
      return !!document.createElement(tag)[atr]
      }
      
      
      
      
      
  var qux = function(tag, atr) {
      return document.createElement(tag).hasOwnProperty(atr);
      }

};
</script>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
!
bar('audio', 'preload');
pending…
!!
baz('audio', 'preload');
pending…
'hasOwnProperty'
qux('audio', 'preload')
pending…

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Revisions

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