Run results for: Map vs Object

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/298.0.595435837 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.2

Device Platform: Mobile

Date tested: 2 years ago

Map lookup

10K/s

Obj lookup

9K/s

View exact numbers

Test name	Executions per second
✓ Map lookup	9,633 Ops/sec
Obj lookup	9,152 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