native vs typed js array speed

JavaScript performance comparison

Revision 33 of this test case created by Jamie Pate

Preparation code 

<script>
  var arraySize = 1000;
  
  var typedArray = new Float32Array(4 * arraySize);
  var nativeArray = new Array(arraySize);
  for (var i =0; i < arraySize; ++i) {
    value = i % 3 ? 1/i : i.toString();
    typedArray[i] = i % 2 ? value : NaN;
    nativeArray[i] = i % 2 ? value : NaN;
  }
</script>
      

      <script>

        Benchmark.prototype.setup = function() {

          
  var sum = 0;

        
  };
          



        Benchmark.prototype.teardown = function() {

          
  if (!sum == 5000) throw Error("Invalid Result " + sum);

        
  };

      
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Native array isNaN 
//Write
for (var i = arraySize; i; i--) {
 nativeArray[i] = i;
}

//Read
for (var i = arraySize; i; i--) {
 sum += +isNaN(nativeArray[i]);
}
 pending…
Typed array isNaN 
//Write
for (var i = arraySize; i; i--) {
 typedArray[i] = i;
}

//Read
for (var i = arraySize; i; i--) {
 sum += +isNaN(typedArray[i]);
}
 pending…
Native Array n[i]!==n[i] 
//Write
for (var i = arraySize; i; i--) {
 nativeArray[i] = i;
}

//Read
for (var i = arraySize; i; i--) {
 sum += +(nativeArray[i]!==nativeArray[i]);
}
 pending…
Typed array n[i]!=n[i] 
//Write
for (var i = arraySize; i; i--) {
 typedArray[i] = i;
}

//Read
for (var i = arraySize; i; i--) {
 sum += +(typedArray[i]!==typedArray[i]);
}
 pending…
Native Array n!==n 
//Write
for (var i = arraySize; i; i--) {
 nativeArray[i] = i;
}

//Read
for (var i = arraySize; i; i--) {
 var n = nativeArray[i]
 sum += +(n!==n);
}
 pending…
Typed array n!==n 
//Write
for (var i = arraySize; i; i--) {
 typedArray[i] = i;
}

//Read
for (var i = arraySize; i; i--) {
 var n = typedArray[i];
 sum += +(n!==n);
}
 pending…

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Revisions

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