Typed array iteration

JavaScript performance comparison

Revision 13 of this test case created by vjeux

Info

Array iteration

Preparation code

<canvas width="512" height="512" id="canvas" style="border: 1px dashed black;"></canvas>
<script>
  var classic = new Array(1048576);
  var context = document.getElementById("canvas").getContext("2d");
  var imageData = context.getImageData(0, 0, 512, 512);
  var canvas = imageData.data;
  if (typeof Uint8Array !== 'undefined') {
   var typed8 = new Uint8Array(1048576);
   var typed32 = new Uint32Array(1048576);
  }
 
  for (var i = 0; i < 1048576; ++i) {
   var number = ~~ (Math.random() * 254)
   classic[i] = number;
   canvas[i] = number;
   if (typeof Uint8Array !== 'undefined') {
    typed8[i] = number;
    typed32[i] = number;
   }
  }
 
  context.putImageData(imageData, 0, 0);
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
Classic
for (var ii = 0; ii < 1048576; ++ii) {
 classic[ii] += 1;
}
pending…
Canvas
for (var ii = 0; ii < 1048576; ++ii) {
 canvas[ii] += 1;
}
pending…
Typed 8
if (typeof Uint8Array === 'undefined') {
 throw "Error";
}

for (var ii = 0; ii < 1048576; ++ii) {
 typed8[ii] += 1;
}
pending…
Typed 32
if (typeof Uint8Array === 'undefined') {
 throw "Error";
}

for (var ii = 0; ii < 1048576; ++ii) {
 typed32[ii] += 1;
}
pending…

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