Array Performance

JavaScript performance comparison

Revision 169 of this test case created by

Preparation code

<script>
  Benchmark.prototype.setup = function() {
    var a1 = [
      {id: 29938, name: 'name1'},
      {id: 32994, name: 'name1'},
      {id: 32995, name: 'name1'},
      {id: 32996, name: 'name1'},
      {id: 32997, name: 'name1'},
      {id: 32998, name: 'name1'},
      {id: 32999, name: 'name1'},
      {id: 33000, name: 'name1'},
      {id: 33001, name: 'name1'},
      {id: 33002, name: 'name1'}
    ];

    var a2 = [];
    a2[29938] = {id: 29938, name: 'name1'};
    a2[32994] = {id: 32994, name: 'name1'};
    a2[32995] = {id: 32995, name: 'name1'};
    a2[32996] = {id: 32996, name: 'name1'};
    a2[32997] = {id: 32997, name: 'name1'};
    a2[32998] = {id: 32998, name: 'name1'};
    a2[32999] = {id: 32999, name: 'name1'};
    a2[33000] = {id: 33000, name: 'name1'};
    a2[33001] = {id: 33001, name: 'name1'};
    a2[33002] = {id: 33002, name: 'name1'};
    var o = {};
    o['29938'] = {id: 29938, name: 'name1'};
    o['32994'] = {id: 32994, name: 'name1'};
    o['32995'] = {id: 32995, name: 'name1'};
    o['32996'] = {id: 32996, name: 'name1'};
    o['32997'] = {id: 32997, name: 'name1'};
    o['32998'] = {id: 32998, name: 'name1'};
    o['32999'] = {id: 32999, name: 'name1'};
    o['33000'] = {id: 33000, name: 'name1'};
    o['33001'] = {id: 33001, name: 'name1'};
    o['33002'] = {id: 33002, name: 'name1'};
  };
</script>
    

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Manual Array Lookup
var id = 33002;
for (var i = 0; i < a1.length; i++) {
  if (a1[i].id === id) result = a1[i];
}
pending…
Holey Array by Index
var id = 33002;
var result = a2[id];
pending…
Object by Key
var id = '33002';
var result = o[id];
pending…

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