Run results for: Map.get vs Object[i] vs Map.has

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:121.0) Gecko/121.0 Firefox/121.0

Browser: Firefox Mobile 121

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Obj get

416K/s

Map get

293K/s

Map has

278K/s

View exact numbers

Test name	Executions per second
✓ Obj get	416,069 Ops/sec
Map get	292,619 Ops/sec
Map has	277,915 Ops/sec

Script Preparation code:

var map = new Map([[1, 1]]);
var obj = {1: 1};
var count = 100; 
var a, i;


for (let j = 0; j < count; j++) {
  map.set(j, j);
  obj[j] = j;
}

Tests:

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