Dynamic versus fixed array

JavaScript performance comparison

Test case created by Joshua

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    dataDynamic = [];
    for (var i = 0, position = 0, length = 100; i < length; i++) {
      var number = Math.floor(Math.random() * 1000);
      dataDynamic[position] = {
        id: 'item' + i,
        last: number + 1000,
        next: number
      };
      position++;
    }
   
    dataFixed = new Array(100);
    for (var i = 0, position = 0, length = 100; i < length; i++) {
      var number = Math.floor(Math.random() * 1000);
      dataFixed[position] = {
        id: 'item' + i,
        last: number + 1000,
        next: number
      };
      position++;
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
Dynamic Array
for (var i = 0, length = 100; i < length; i++) {
  console.log(dataDynamic[i])
}
pending…
Fixed Array
for (var i = 0, length = 100; i < length; i++) {
  console.log(dataFixed[i])
}
pending…

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