delete vs undefined vs null

JavaScript performance comparison

Revision 50 of this test case created by

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
 delete o.p;
// o.p = 1;
var x = o.p;
pending…
delete object["property"]
 delete o["p"];
// o.p = 1;
var x = o.p;
pending…
object.property = null
 o.p = null;
// o.p = 1;
var x = o.p;
pending…
object["property"] = null
 o["p"] = null;
// o.p = 1;
var x = o.p;
pending…
object.property = undefined
 o.p = undefined;
// o.p = 1;
var x = o.p;
pending…
object["property"] = undefined
 o["p"] = undefined;
// o.p = 1;
var x = o.p;
pending…

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