Run results for: Map.get vs Object property access and more

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Map get exists

183.6M/s

Map get does not exist

163.0M/s

Object set

114.5M/s

Object get exists

104.7M/s

Map set

92.1M/s

Object get does not exist

87.8M/s

View exact numbers

Test name	Executions per second
✓ Map get exists	183,628,768 Ops/sec
Map get does not exist	162,990,640 Ops/sec
Object set	114,451,376 Ops/sec
Object get exists	104,722,208 Ops/sec
Map set	92,069,256 Ops/sec
Object get does not exist	87,842,024 Ops/sec

Script Preparation code:

obj = {foo: 'bar'};
map = new Map(Object.entries(obj));

for (let i = 0; i < 10000; i++) {
  const key = Math.random();
  obj[key] = i;
  map.set(key, i);
}

Tests:

Map get exists
const x = map.get("foo")
Object get exists
const x = obj["foo"]
Map get does not exist
const x = map.get("not here")
Object get does not exist
const x = obj["not here"]
Map set
map.set("new key", 1);
Object set
obj["new key"] = 1;