Try/Catch Error Perf

JavaScript performance comparison

Revision 30 of this test case created by Jason McAffee

Preparation code

<script>
  //show test results for most likely scenario
  var testWithValue = {prop:'test'};

  function tryCatch(undef) {
    try {
      return undef.prop;
    } catch (ex) {
      return null;
    }
  }

  function ifUndefinedCheck(undef) {
    if (undef !== undefined) {
      return undef.prop;
    } else {
      return null;
    }
  }
function ifTypeofCheck(undef) {
    if (typeof undef !== 'undefined') {
      return undef.prop;
    } else {
      return null;
    }
  }

function ifCheckExists(undef) {
    if (undef) {
      return undef.prop;
    } else {
      return null;
    }
  }

function ifCheckTernary(undef) {
    return undef ? undef.prop :null;
  }
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Try Catch
tryCatch();
pending…
If Undefined Check
ifUndefinedCheck();
pending…
If Typeof Check
ifTypeofCheck();
pending…
If Exists Check
ifCheckExists();
pending…
Ternary Check
ifCheckTernary();
pending…
Try Catch with Value
tryCatch(testWithValue);
pending…
If Undefined Check with Value
ifUndefinedCheck(testWithValue);
pending…

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Revisions

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