delete vs undefined vs null

JavaScript performance comparison

Revision 115 of this test case created by

Preparation code


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

};
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

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

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

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

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

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

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

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

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL.

0 Comments