delete vs undefined vs null

JavaScript performance comparison

Revision 64 of this test case created by and last updated

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
    o = {
     p: 1
    };
    var id = 0
    
    function reset() {
     o.p = ++id;
    }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
object.property = null

var i;
for (i = 0; i < 100; i++) {
 o.p = null;
 reset();
}
pending…
object.property = undefined
var i;
for (i = 0; i < 100; i++) {
 o.p = undefined;
 reset();
}
pending…
delete object.property
var i;
for (i = 0; i < 100; i++) {
 delete o.p;
 reset();
};
pending…

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