delete vs set to undefined

JavaScript performance comparison

Test case created by Jean-François Ducarroz

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var myMap = {}
  
  for (i = 0; i < 1000; i ++) {
   myMap[i] = {id: i};
  }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
delete
for (i = 0; i < 1000; i ++) {
 delete myMap[i];
}
pending…
set to undefined
for (i = 0; i < 1000; i ++) {
 myMap[i] = undefined;
}
pending…
set to null
for (i = 0; i < 1000; i ++) {
 myMap[i] = null;
}
pending…

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