Array Performance

JavaScript performance comparison

Revision 52 of this test case created

Info

Manual array lookups vs. holey arrays.

Preparation code

<script>
  Benchmark.prototype.setup = function() {
    var a1 = [], o = {}, a2=null;
    for( i=0; i <=250; i ++){
      a1.push( { id: i, name: 'name' });
      o[i] = { id: i, name: 'name' };
    }
  };
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Manual Array Lookup
var id = 500 ;
for (var i = 0; i < a1.length; i++) {
  if (a1[i].id = id) result = a1[i];
}
 
pending…
Object by Key
var id = 500;
var result = o[id];
 
pending…

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