Run results for: Object Indexed Properties (Read)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser: Chrome 53

Operating system: Mac OS X 10.11.6

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
Array	1200.4 Ops/sec
Object	1192.4 Ops/sec
Sparse Array	1096.4 Ops/sec
Sparse Object	1120.1 Ops/sec

Script Preparation code:

var LIMIT = 10000;

var ARRAY = [];
var OBJECT = {};
var SPARSE_ARRAY = [];
var SPARSE_OBJECT = {};

for (var i = 0; i < LIMIT; i++) {
  ARRAY[i] = i;
  OBJECT[i] = i;
  if (i % 2 === 0) {
    SPARSE_ARRAY[i] = i;
    SPARSE_OBJECT[i] = i;
  }
}

​x
 
var LIMIT = 10000;​var ARRAY = [];var OBJECT = {};var SPARSE_ARRAY = [];var SPARSE_OBJECT = {};​for (var i = 0; i < LIMIT; i++) {  ARRAY[i] = i;  OBJECT[i] = i;  if (i % 2 === 0) {    SPARSE_ARRAY[i] = i;    SPARSE_OBJECT[i] = i;  }}

Tests:

Array

var total = 0;
var target = ARRAY;

for (var i = 0; i < LIMIT; i++) {
  total += target[i];
}

return total;

 
var total = 0;var target = ARRAY;​for (var i = 0; i < LIMIT; i++) {  total += target[i];}​return total;

Object

var total = 0;
var target = OBJECT;

for (var i = 0; i < LIMIT; i++) {
  total += target[i];
}

return total;

 
var total = 0;var target = OBJECT;​for (var i = 0; i < LIMIT; i++) {  total += target[i];}​return total;

Sparse Array

var total = 0;
var target = SPARSE_ARRAY;

for (var i = 0; i < LIMIT; i++) {
  if (i in target) {
    total += target[i];
  }
}

return total;

 
var total = 0;var target = SPARSE_ARRAY;​for (var i = 0; i < LIMIT; i++) {  if (i in target) {    total += target[i];  }}​return total;

Sparse Object

var total = 0;
var target = SPARSE_OBJECT;

for (var i = 0; i < LIMIT; i++) {
  if (i in target) {
    total += target[i];
  }
}

return total;

 
var total = 0;var target = SPARSE_OBJECT;​for (var i = 0; i < LIMIT; i++) {  if (i in target) {    total += target[i];  }}​return total;