Run results for: Object key access vs array finds

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
object	22798.9 Ops/sec
map	12105.4 Ops/sec
array	1468.3 Ops/sec

Script Preparation code:

var items = Array.from(Array(1000), (_,x) => ({key: x, value: x*10}));

var objContainer = {};
var arrContainer = [];
var mapContainer = new Map();

for (let i = 2000; i >= 0; i--) {
  const index = Math.floor(Math.random() * 1000);
  const item = items[index];
  objContainer[item.key] = item;
  arrContainer.push(item);
  mapContainer.set(item.key,item);
}

Tests:

object
items.forEach(item => objContainer[item.value])
map
items.forEach(item => mapContainer.get(item.value))
array
items.forEach(item => arrContainer.find(containerItem => containerItem.value === item.value))

Run results for: Object key access vs array finds

object

map

array