Array Performance (v28)

Revision 28 of this benchmark created by David Bonnet on

Description

Manual array lookups vs. holey arrays.

Setup

a1 = [];
    var amount=35000;
    for (var i=0; i < amount; i++) {
      a1.push({id: i, name: 'name1'});
    }

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

    a3 = [{id: 29938, name: 'name1'}, {id: 32994, name: 'name1'}];

    var o1 = {};
    o1[29938] = {id: 29938, name: 'name1'};
    o1[32994] = {id: 32994, name: 'name1'};

Test runner

Ready to run.

Testing in
TestOps/sec
Manual Array Lookup
var id = 29938, result, l = a1.length;
for (var i = 0; i < l; i++) {
  if (a1[i].id == id) {
    result = a1[i];
    break;
  }
}
ready
Holey Array by Index
var id = 29938, result = a2[id];
ready
Object by Key
var id = 29938, result = o1[id];
ready
Manual Array Lookup (small)
var id = 29938, result, l = a3.length;
for (var i = 0; i < l; i++) {
  if (a3[i].id == id) {
    result = a3[i];
    break;
  }
}
ready

Revisions

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