delete vs undefined vs null

JavaScript performance comparison

Revision 35 of this test case created by Check if defined before delete

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var o = {
    p: 1
  };

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
delete object.property
o.p = 1;
delete o.p;
pending…
delete object["property"]
o.p = 1;
delete o["p"];
pending…
check if defined
o.p = 1;
if (o.p) {
  o.p = 1;
}
pending…
delete if defined
o.p = 1;
if (o.p) {
  delete o.p;
}
pending…
object.property = null
o.p = 1;
o.p = null;
pending…
object.property = undefined
o.p = 1;
o.p = undefined;
pending…

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Revisions

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