native vs typed js array speed

JavaScript performance comparison

Revision 37 of this test case created by

Preparation code

<script>
  var arraySize = 10000;
  
  var typedArray = new Int32Array(4 * arraySize);
  var nativeArray = new Array(arraySize);
</script>
      
<script>
Benchmark.prototype.setup = function() {
  var sums = {};

};

Benchmark.prototype.teardown = function() {
  if (sums[49995000] != 49995000) {
    throw "failure"
  }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Native array
var sum = 0;

//Write
for (var i = 0; i < arraySize; i++) {
 nativeArray[i] = i;
}

//Read
for (var i = 0; i < arraySize; i++) {
 sum += nativeArray[i];
}

sums[sum] = sum;
pending…
Typed array
var sum = 0;

//Write
for (var i = 0; i < arraySize; i++) {
 typedArray[i] = i;
}

//Read
for (var i = 0; i < arraySize; i++) {
 sum += typedArray[i];
}

sums[sum] = sum;
pending…

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Revisions

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