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

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:147.0) Gecko/147.0 Firefox/147.0

Browser: Firefox Mobile 147

Operating system: Android

Device Platform: Mobile

Date tested: 5 months ago

Obj lookup

139K/s

Map lookup

89K/s

View exact numbers

Test name	Executions per second
✓ Obj lookup	139,263 Ops/sec
Map lookup	89,486 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