Array Performance 42

JavaScript performance comparison

Revision 33 of this test case created

Info

Manual array lookups vs. holey arrays.

Preparation code

<script>
  Benchmark.prototype.setup = function() {
    var a1 = [];
    for (var i = 0; i < 1000; i++){
        a1.push({id: i, name: 'name' + i});
    }

    var a2 = [];
    for (var i = 0; i < 1000; i++){
        a2.push({id: i, name: 'name' + i});
    }

    var o = {};
    for (var i = 0; i < 1000; i++){
        o[i.toString()] = {id: i, name: 'name' + i};
    }
  };
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Manual Array Lookup
var id = 500,
    result;
for (var i = 0; i < a1.length; i++) {
  if (a1[i].id === id){
      result = a1[i];
      break;
  }
}
 
pending…
Holey Array by Index
var id = 500;
var result = a2[id];
pending…
Object by Key
var id = '500';
var result = o[id];
 
pending…

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