Swap two numbers without tmp var

JavaScript performance comparison

Test case created by bfontaine

Info

Note: this won't work with very big numbers.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = Math.random()*500,
        b = Math.random()*500;
};
</script>

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Testing in unknown unknown
Test Ops/sec
Long version
a = a+b;
b = a-b;
a = a-b;
pending…
Short version
b=(a+(a=b))-b;
pending…

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