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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36 Edg/142.0.0.0

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Map get does not exist

181.5M/s

Map get exists

171.8M/s

Map set

101.4M/s

Object get exists

100.3M/s

Object get does not exist

95.0M/s

Object set

78.3M/s

View exact numbers

Test name	Executions per second
✓ Map get does not exist	181,485,808 Ops/sec
Map get exists	171,813,456 Ops/sec
Map set	101,371,312 Ops/sec
Object get exists	100,321,088 Ops/sec
Object get does not exist	94,951,464 Ops/sec
Object set	78,251,128 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;