Run results for: Map vs Object - Lookup and write

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/129.0.6668.69 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 129

Operating system: iOS 17.6

Device Platform: Mobile

Date tested: one year ago

Map lookup

13K/s

Obj lookup

13K/s

Obj set

11K/s

Map set

9K/s

View exact numbers

Test name	Executions per second
✓ Map lookup	12,946 Ops/sec
Obj lookup	12,539 Ops/sec
Obj set	11,413 Ops/sec
Map set	8,692 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']; }
Map set
for (i = 0; i < count; i++) { a = map.set(i+'', i); }
Obj set
for (i = 0; i < count; i++) { obj[i+''] = i; }

Run results for: Map vs Object - Lookup and write

Lookup/write of map vs object

Map lookup

Obj lookup

Map set

Obj set