Run results for: Option chaining and typeof - MeasureThat.net

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: 10 months ago

Test name	Executions per second
Optional chaining, not null	17097370.0 Ops/sec
Explicit null check, not null	8556481.0 Ops/sec
Optional chaining, null	16938890.0 Ops/sec
Explicit null check, null	16811770.0 Ops/sec

Website performance monitoring

Script Preparation code:

window._x = { y: 4 };
window._z = null;

Tests:

Optional chaining, not null
let a = typeof _x?.y === `number`;
Explicit null check, not null
let a = _x != null && typeof _x.y === `number`;
Optional chaining, null
let a = typeof _z?.y === `number`;
Explicit null check, null
let a = _z != null && typeof _z.y === `number`;