Run results for: Map() vs Object

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 Edg/107.0.1418.35

Browser: Chrome 107

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Using Object	15674384.0 Ops/sec
Using Map()	6472529.5 Ops/sec

Tests:

Using Object

const arr = [
  {name: 'name1', prop: 'prop'}, 
  {name: 'name2', prop: 'prop'}, 
  {name: 'name3', prop: 'prop'}, 
  {name: 'name4', prop: 'prop'}
]

const obj = {};

arr.forEach(a => obj[a.name] = a)

​x
 
const arr = [  {name: 'name1', prop: 'prop'},   {name: 'name2', prop: 'prop'},   {name: 'name3', prop: 'prop'},   {name: 'name4', prop: 'prop'}]​const obj = {};​arr.forEach(a => obj[a.name] = a)

Using Map()

const arr = [
  {name: 'name1', prop: 'prop'}, 
  {name: 'name2', prop: 'prop'}, 
  {name: 'name3', prop: 'prop'}, 
  {name: 'name4', prop: 'prop'}
]

const mp = new Map();
arr.forEach((a) => {
  mp.set(a.name, a);
});

 
const arr = [  {name: 'name1', prop: 'prop'},   {name: 'name2', prop: 'prop'},   {name: 'name3', prop: 'prop'},   {name: 'name4', prop: 'prop'}]​const mp = new Map();arr.forEach((a) => {  mp.set(a.name, a);});