in vs subscript membership test

JavaScript performance comparison

Test case created

Preparation code

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

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

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Testing in unknown unknown
Test Ops/sec
subscript
if (a['b'] != null) {
  a.b = 5;
}
pending…
in
if ('b' in a) {
  a.b = 5;
}
pending…
dot
if (a.b != null) {
  a.b = 5;
}
pending…

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