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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser: Chrome 143

Operating system: Linux

Device Platform: Desktop

Date tested: 6 months ago

Map get exists

79.9M/s

Map get does not exist

76.9M/s

Map set

44.8M/s

Object get exists

43.7M/s

Object get does not exist

41.4M/s

Object set

38.0M/s

View exact numbers

Test name	Executions per second
✓ Map get exists	79,874,040 Ops/sec
Map get does not exist	76,875,808 Ops/sec
Map set	44,821,016 Ops/sec
Object get exists	43,721,352 Ops/sec
Object get does not exist	41,437,044 Ops/sec
Object set	38,020,880 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;