delete vs undefined vs null

JavaScript performance comparison

Revision 56 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var o = {};
  for(var i = 0; i < 100; i++) {
      o[i] = true;
  }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
delete object["property"]
for(var i = 0; i < 100; i++) {
    delete o[i];
}
pending…
object["property"] = null
for(var i = 0; i < 100; i++) {
   o[i] = null;
}
pending…
object["property"] = undefined
for(var i = 0; i < 100; i++) {
   o[i] = undefined;
}

pending…

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