Editing Typed array iteration

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

<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);

function test_classic() {
    for (var ii = 0; ii < 1048576; ++ii) {
      classic[ii] += 1;
    }
  }

function test_canvas() {
    for (var ii = 0; ii < 1048576; ++ii) {
      canvas[ii] += 1;
    }
  }

function test_typed8() {
    if (typeof Uint8Array === 'undefined') {
      throw "Error";
    }

for (var ii = 0; ii < 1048576; ++ii) {
      typed8[ii] += 1;
    }
  }

function test_typed32() {
    if (typeof Uint8Array === 'undefined') {
      throw "Error";
    }

for (var ii = 0; ii < 1048576; ++ii) {
      typed32[ii] += 1;
    }
  }
</script>

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

test_classic();

Test 2

Title

Async (check if this is an asynchronous test)

Code

test_canvas();

Test 3

Title

Async (check if this is an asynchronous test)

Code

test_typed8();

Test 4

Title

Async (check if this is an asynchronous test)

Code

test_typed32();