type detection

JavaScript performance comparison

Revision 4 of this test case created by shesek

Preparation code

<script>
  var subject = [1, 2, 3, 4, 5],
      toString = Object.prototype.toString;
</script>

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Testing in unknown unknown
Test Ops/sec
Object.prototype.toString.call
(Object.prototype.toString.call(subject) === "[object Array]")
pending…
duck typing
(typeof subject === "object" && typeof subject.join !== 'undefined' && typeof subject.length === "number")
pending…
toString
(toString.call(subject) === "[object Array]")
pending…

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