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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36 Edg/108.0.1462.54

Browser: Chrome 108

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Optional chaining, not null	7292273.5 Ops/sec
Explicit null check, not null	3669572.5 Ops/sec
Optional chaining, null	6799220.5 Ops/sec
Explicit null check, null	6701105.5 Ops/sec

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`;

;