assign if not defined

JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var thing1 = Math.round(Math.random()), thing2;
};
</script>

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Testing in unknown unknown
Test Ops/sec
= ||
thing1 = thing1 || Math.round(Math.random());
thing2 = thing2 || Math.round(Math.random());
pending…
|| (=)
thing1 || (thing1 = Math.round(Math.random()));
thing2 || (thing2 = Math.round(Math.random()));
pending…

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