check if string is number

JavaScript performance comparison

Revision 2 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    a='12345';
};

Benchmark.prototype.teardown = function() {
    delete x;
};
</script>

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Testing in unknown unknown
Test Ops/sec
isNaN
var x=isNaN(a);
pending…
compare to self
var x=!(parseInt(a)===parseInt(a));
pending…
regex
var x=a.match(/[0-9]/);
pending…

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