Run results for: Map vs Object

Run details:

User agent: Mozilla/5.0 (Linux; U; Android 10; en-gb; Nokia 2.3 Build/QP1A.190711.020) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.128 Mobile Safari/537.36 XiaoMi/Mint Browser/3.6.0

Browser: Chrome Mobile 61

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
Map lookup	488.5 Ops/sec
Obj lookup	560.1 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};

map.set('a', 5);
obj['a'] = 5;

var i = 0, count = 1000, a;

Tests:

Map lookup
for (i = 0; i < count; i++) { a = map.get('a'); }
Obj lookup
for (i = 0; i < count; i++) { a = obj['a']; }

Run results for: Map vs Object

Lookup of map vs object

Map lookup

Obj lookup