delete vs undefined vs null

JavaScript performance comparison

Revision 118 of this test case created by Keegan Caradonna

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var map = new Map();
  for (var i = 0; i<1000; i++) {
    map.set(i, i);
  }
  
  var obj = {}
  for (var i = 0; i<1000; i++) {
    obj[i] = i;
  }

};
</script>

Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
delete object.property
for (var i = 0; i<1000; i++) {
  delete obj[i];
}

var loopCounter = 0;
Object.keys(obj).forEach(function() {
  loopCounter++;
});
pending…
object.property = false
for (var i = 0; i<1000; i++) {
   obj[i] = false;
}

var loopCounter = 0;
Object.keys(obj).forEach(function() {
  loopCounter++;
});
pending…
object["property"] = false
for (var i = 0; i<1000; i++) {
   map.delete(i);
}

var loopCounter = 0;
map.forEach(function() {
  loopCounter++;
});
pending…
object.property = null
for (var i = 0; i<1000; i++) {
   obj[i] = null;
}

var loopCounter = 0;
Object.keys(obj).forEach(function() {
  loopCounter++;
});
pending…

Revisions

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