native vs typed js array speed

JavaScript performance comparison

Revision 91 of this test case created by Andrew Garson

Preparation code

<script>
  var arraySize = 10000;
  
  var typedArray = new Int32Array(4 * arraySize);
  var nativeArray = new Array(arraySize);
  var arrayBuffer = new ArrayBuffer(4 * arraySize),
      dataView = new DataView(arrayBuffer);
</script>
    

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Native array
//Write
for (var j=0,i = 0; i < arraySize; i++) {
 nativeArray[i] = 125*((j++ *(12*i)+i)%10);
}

//Read
for (var i = 0; i < arraySize; i++) {
 var value = nativeArray[i];
}
pending…
Typed array
//Write
for (var j=0,i = 0; i < arraySize; i++) {
 typedArray[i] = 125*((j++ *(12*i)+i)%10);
}

//Read
for (var i = 0; i < arraySize; i++) {
 var value = typedArray[i];
}
pending…
DataView
//Write
for (var j=0,i = 0; i < 4 * arraySize; i+=4) {
 dataView.setInt32(i, 125*((j++ *(12*i)+i)%10), true);
}

//Read
for (var i = 0; i < arraySize; i++) {
 var value = dataView.getInt32(i);
}
pending…

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Revisions

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