Run results for: Map vs Object - the real test

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; Pixel 4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Mobile Safari/537.36

Browser: Chrome Mobile 91

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
Map lookup	7648188.0 Ops/sec
Obj lookup	7616994.0 Ops/sec
Map set	712227.2 Ops/sec
Obj set	1521999.2 Ops/sec
hasOwnProperty	7102814.0 Ops/sec
has	7651880.0 Ops/sec
delete	1350361.0 Ops/sec
remove	823338.6 Ops/sec
array lookup	7554831.5 Ops/sec

Script Preparation code:

var map1 = new Map();
var obj1 = {};

map1.set(0, 5);
obj1[0] = 5;

var map2 = new Map();
var obj2 = {};
var arrString = [];
for (var i = 0; i < 10000000; i++) {
  arrString.push(i);
}
var arr = [1,2,3,null,5];
var a = 0, b = 0, c = 0, d = 0;

Tests:

Map lookup
map1.get('aaa');
Obj lookup
obj1['aaa'];
Map set
map2.set(arrString[a++], 1);
Obj set
obj2[arrString[b++]] = 1;
hasOwnProperty
obj1.hasOwnProperty('aaa');
has
map1.has('aaa');
delete
delete obj2[arrString[c++]];
remove
map2.delete(arrString[d++]);
array lookup
arr[2]

Run results for: Map vs Object - the real test

Lookup of map vs object

Map lookup

Obj lookup

Map set

Obj set

hasOwnProperty

has

delete

remove

array lookup