multi try catch VS single

JavaScript performance comparison

Revision 3 of this test case created

Info

check overhead of using try catch on every operation VS on a single wrapping operation and with errors and without

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var testAmount = 100;
    var random = Math.random;
  };
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Multi try catch - no fail
 
function runTest() {
  for (var i = 0; i < testAmount; ++i) {
    try {
      window.x = random();
    } catch (e) {
      var y = e.stack;
    }
  }
}
runTest()
 pending…
Single try catch - no fail
 
function runTest() {
  try {
    for (var i = 0; i < testAmount; ++i) {
      window.x = random();
    }
  } catch (e) {
    var y = e.stack;
  }
}
runTest()
 pending…
Multi try catch - fail
 
function runTest() {
  for (var i = 0; i < testAmount; ++i) {
    try {
      window.x = random();
      throw new Error('test error');
    } catch (e) {
      var y = e.stack;
    }
  }
}
runTest()
 pending…
Single try catch - fail
 
function runTest(index) {
  index = index || 0;
  var i;
  try {
    for (i = index; i < testAmount; ++i) {
      window.x = random();
      throw new Error('test error');
    }
  } catch (e) {
    var y = e.stack;
    runOnError(i + 1);
  }
}

function runOnError(index) {
  runTest(index);
}
runTest()
 pending…
Single try catch - fail (not real error)
 
function runTest(index) {
  index = index || 0;
  var i;
  try {
    for (i = index; i < testAmount; ++i) {
      window.x = random();
      throw 'error!!!!';
    }
  } catch (e) {
    var y = e;
    runOnError(i + 1);
  }
}

function runOnError(index) {
  runTest(index);
}
runTest()
 pending…

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