Run results for: Option chaining and typeof 2

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

Script Preparation code:

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

Tests:

Optional chaining, not null
let a = typeof (_x === null || _x === void 0 ? void 0 : _x.y) === `number`;
Explicit null check, not null
let a = _x != null && typeof _x.y === `number`;
Optional chaining, null
let a = typeof (_z === null || _z === void 0 ? void 0 : _z.y) === `number`;
Explicit null check, null
let a = _z != null && typeof _z.y === `number`;