Early return or not

JavaScript performance comparison

Revision 2 of this test case created by Chris Khoo

Preparation code

<script>
function once() {
  var done = false;
  return function() {
    if (done) {
      return undefined;
    } else {
      done = true;
      return 1;
    }
  }
}

function onceEarlyReturn() {
  var done = false;
  return function() {
    if (done) return undefined;
    done = true;
    return 1;
  }
}
</script>

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Testing in unknown unknown
Test Ops/sec
once
once();
once();
once();
once();
once();
once();
once();
pending…
onceEarlyReturn
onceEarlyReturn();
onceEarlyReturn();
onceEarlyReturn();
onceEarlyReturn();
onceEarlyReturn();
onceEarlyReturn();
onceEarlyReturn();
pending…

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Revisions

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