in or property

JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    function donothing() {}
    var what = 'body';
};
</script>

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Testing in unknown unknown
Test Ops/sec
in
if (what in document) {
donothing()
}
pending…
direct
if (document.body) {
donothing()
}
pending…
direct string
if (document[what]) {
donothing()
}
pending…
in string
if ('body' in document) {
donothing()
}
pending…

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