Array Performance

JavaScript performance comparison

Revision 67 of this test case created

Info

Manual array lookups vs. holey arrays.

Preparation code

<script>
  Benchmark.prototype.setup = function() {
    var a1 = [{id: 29938, name: 'name1'}, {id: 32994, name: 'name2'}];

    var a2 = [];
    a2[29938] = 'name1';
    a2[32994] = 'name2';

    var o = {};
    o[29938] = 'name1';
    o[32994] = 'name2';
  };
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Manual Array Lookup
var id = 29938;
for (var i = a1.length; i--; ) {
  if (a1[i].id = id) result = a1[i].name;
}
 
pending…
Holey Array by Index
var id = 29938;
var result = a2[id];
pending…
Object by Key
var id = 29938;
var result = o[id];
 
pending…

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