Array Performance (v158)

Revision 158 of this benchmark created by jansen on

Description

Manual array lookups vs. holey arrays.

Setup

var a1 = [{id: 44, name: 'name1'}, {id: 32994, name: 'name1'},{id: 299383, name: 'name1'}, {id: 32993, name: 'name1'},{id: 29936, name: 'name1'}, {id: 0, name: 'name1'},{id: 2, name: 'name1'}, {id: 29938, name: 'name1'}];

    var a2 = [];
    a2[44] = {id: 44, name: 'name1'};
    a2[299383] = {id: 299383, name: 'name1'};    
    a2[32993] = {id: 32993, name: 'name1'};
    a2[29936] = {id: 29936, name: 'name1'}; 
    a2[0] = {id: 0, name: 'name1'};
    a2[2] = {id: 2, name: 'name1'};
    a2[32994] = {id: 32994, name: 'name1'};
  a2[29938] = {id: 29938, name: 'name1'};

    var o = {};
    o[44] = {id: 44, name: 'name1'};
    o[299383] = {id: 299383, name: 'name1'};    
    o[32993] = {id: 32993, name: 'name1'};
    o[29936] = {id: 29936, name: 'name1'}; 
    o[0] = {id: 0, name: 'name1'};
    o[2] = {id: 2, name: 'name1'};
    o[32994] = {id: 32994, name: 'name1'};
    o[29938] = {id: 29938, name: 'name1'};

Test runner

Ready to run.

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

Revisions

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