Run results for: Map vs Object - More items6

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Map lookup

4K/s

Obj lookup

4K/s

View exact numbers

Test name	Executions per second
✓ Map lookup	4,246 Ops/sec
Obj lookup	3,723 Ops/sec

Script Preparation code:

var map = new Map();
var obj = {};
for (let i = 0; i < 50; i++) {
  map.set('a' + i, i);
  obj['a' + i] = i;
}
obj = Object.freeze(obj)

var i = 0, count = 1000, a;

Tests:

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

Run results for: Map vs Object - More items6

Lookup of map vs object

Map lookup

Obj lookup