string ops vs. RegExp

JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var pngSuffixes = {
        png:true,
        PNG:true,
        Png:true
    };
    var src = "test.png";
    _counter = 0;
};
</script>

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Testing in unknown unknown
Test Ops/sec
RegExp
if (/\.png$/i.test(src)) {
    _counter++;
}
pending…
string ops
if (src && pngSuffixes[src.substring(src.lastIndexOf('.') + 1)]) {
    _counter++;
}
pending…

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