hasOwnProperty vs !!

JavaScript performance comparison

Test case created by Benny

Info

Performance test of Object.hasOwnProperty vs !!Object.property.

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>

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

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