propertyIsEnumerable vs. hasOwnProperty

JavaScript performance comparison

Test case created by Cezary Tomczyk

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var o = {
      p1: 1,
      p2: 2,
      p3: 3,
      p4: 4
    },
        r;
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
propertyIsEnumerable
for (key in o) {
  if (Object.prototype.propertyIsEnumerable.call(o, key)) {
    r = true;
  }
}
pending…
hasOwnProperty
for (key in o) {
  if (Object.prototype.hasOwnProperty.call(o, key)) {
    r = true;
  }
}
pending…

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