find element in obj vs array

JavaScript performance comparison

Revision 9 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var obj = {},
      arr = [],
      count = 0;
    for (var i = 0; i < 1000; i++) {
      arr.push(i);
      obj[i] = 1;
    }
   
   
    function in_array(needle, haystack) {
      for (var i = 0, maxi = haystack.length; i < maxi; ++i) {
        if (haystack[i] == needle) {
          return true;
        }
      }
      return false;
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
find in array (1)
if (in_array(100, arr)) {
  count++;
}
pending…
find in array (5)
if (in_array(500, arr)) {
  count++;
}
pending…
find in array (20)
if (in_array(900, arr)) {
  count++;
}
pending…
find in obj (1)
if (obj[100]) {
  count++;
}
pending…
find in obj (5)
if (obj[500]) {
  count++;
}
pending…
find in obj (20)
if (obj[900]) {
  count++;
}
pending…

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