Run results for: self-assignment vs. if condition

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
if condition	7527238.0 Ops/sec
self-assignment	31347190.0 Ops/sec

Tests:

if condition
const x = { foo: [] }; const keys = ["foo", "bar"]; for (const key of keys) { if (!Object.prototype.hasOwnProperty.call(x, key)) { x[key] = []; } }
self-assignment
const x = { foo: [] }; const keys = ["foo", "bar"]; for (const key of keys) { x[key] = x[key] ?? []; }