strict equals undefined comparison

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

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

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Testing in unknown unknown
Test Ops/sec
equal undefined
if (foo == undefined) return 'foo is undefined';
pending…
strict equal undefined
if (foo === undefined) return 'foo is undefined';
pending…
typeof ==
if (typeof foo === 'undefined') return 'foo is undefined';
pending…
typeof ===
if (typeof foo == 'undefined') return 'foo is undefined'
pending…

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