undefined-vs-null a&b

JavaScript performance comparison

Revision 2 of this test case created by tomByrer

Info

Note: b doesn't exist!

Preparation code

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

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Testing in unknown unknown
Test Ops/sec
undef a
for (var i = 0; i < 100; ++i) {
  a[i] = undefined;
}
pending…
null a
for (var i = 0; i < 100; ++i) {
  a[i] = null;
}
pending…
undef b
for (var i = 0; i < 100; ++i) {
  b[i] = undefined;
}
pending…
null b
for (var i = 0; i < 100; ++i) {
  b[i] = null;
}
pending…

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