Array Performance

JavaScript performance comparison

Revision 59 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: 'name1'}];

    var a2 = [];
    a2[29938] = {id: 29938, name: 'name1'};
    a2[32994] = {id: 32994, name: 'name1'};

    var o = {};
    o['29938'] = {id: 29938, name: 'name1'};
    o['32994'] = {id: 32994, name: 'name1'};
  };
</script>

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Testing in unknown unknown
Test Ops/sec
Manual Array Lookup
var id = 29938;
for (var i = 0; i < a1.length; i++) {
  if (a1[i].id = id) result = a1[i];
}
 
pending…
Holey Array by Index
var id = 29938;
var result = a2[id];
pending…
Object by Key
var id = '29938';
var result = o[id];
 
pending…
Object by index
var id = 29938;
var result = o[id];
pending…
Manual array lookup w/ brek
var id = 29938;
var result = 0
for (var i = 0; i < a1.length; i++) {
  if (a1[i].id = id) { result = a1[i]; break; }
}
pending…

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