hasOwnProperty

JavaScript performance comparison

Revision 3 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var obj = {
      what: 1,
      is: 2,
      dis: 3,
      omg: 4,
      i: 5,
      dunno: 6
    };
};
</script>

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Testing in unknown unknown
Test Ops/sec
obj.hasOwnProperty(key) (in)
var a = obj.hasOwnProperty('is');
pending…
obj.hasOwnProperty(key) (NOT in)
var a = obj.hasOwnProperty('nis');
pending…
typeof obj[key] === 'undefined'(in)
var a = typeof obj['is'] !== 'undefined';
pending…
typeof obj[key] === 'undefined'(NOT in)
var a = typeof obj['nis'] !== 'undefined';
pending…
obj[key] === undefined (in)
var a = obj['is'] !== undefined;
pending…
obj[key] === undefined (NOT in)
var a = obj['nis'] !== undefined;
pending…
obj[key] === local_undefined (in)
var u;
var a = obj['is'] !== u;
pending…
obj[key] === local_undefined (NOT in)
var u;
var a = obj['nis'] !== u;
pending…
key in obj (in)
var a = ('is' in obj);
pending…
key in obj (NOT in)
var a = ('nis' in obj);
pending…

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