Object Property Existence

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var A = {
      foo: ''
    };
    var a = 'foo';
   
};
</script>

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Testing in unknown unknown
Test Ops/sec
A.hasOwnProperty(a)
A.hasOwnProperty(a)
pending…
A[a] || A.hasOwnProperty(a)
A[a] || A.hasOwnProperty(a)
pending…
a in A
a in A
pending…
A[a] || a in A
A[a] || a in A
pending…

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