Array Performance (v145)

Revision 145 of this benchmark created by Jonathan Perry on

Description

Manual array lookups vs. holey arrays.

Setup

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 o1 = { 0: {id: 29938, name: 'name1'}, 1: {id: 32994, name: 'name1'} };

    var o2 = { 29938: {id: 29938, name: 'name1'}, 32994: {id: 32994, name: 'name1'} };

Test runner

Ready to run.

Testing in
TestOps/sec
Manual Array Lookup
var id = 29938;
for (var i = 0; i < a1.length; 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 (1)
var id = 29938;
var result = o2[id];
ready
Manual Array Lookup with variables
var id = 29938;
for (var i = 0, aval = a1.length; i < aval; i++) {
  if (a1[i].id = id) result = a1[i];
}
ready
Manual Array Lookup with variables and break
var id = 29938;
for (var i = 0, aval = a1.length; i < aval; i++) {
  if (a1[i].id = id) {
    result = a1[i];
    break;
  }
}
ready
Array by Index
var id = 0;
var result = a1[id];
ready
Object by Key (2)
var id = 0;
var result = o1[id];
ready

Revisions

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