Run results for: Map vs Object.create(null)

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 137

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Obj lookup

3K/s

Map lookup

2K/s

View exact numbers

Test name	Executions per second
✓ Obj lookup	3,312 Ops/sec
Map lookup	2,399 Ops/sec

Script Preparation code:

var map = new Map();
var obj = Object.create(null);

for (let i = 0; i < 20; ++i) {
  map.set(i, i)
  obj[i] = i
}

var i = 0, count = 1000, a;

Tests:

Map lookup
for (i = 0; i < count; i++) { a = map.get(i % 20); }
Obj lookup
for (i = 0; i < count; i++) { a = obj[i % 20]; }

Run results for: Map vs Object.create(null)

Lookup of map vs object

Map lookup

Obj lookup