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LinkedIn · Typescript
Practice Typescript questions specifically asked in LinkedIn interviews – ideal for online test preparation, technical rounds and final HR discussions.
Questions
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Typescript
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Go through each question and its explanation. Use this page for targeted revision just before your LinkedIn Typescript round.
The “infer U” captures whatever a Promise resolves to. If T is Promise<string>, U becomes string.
type P<T> = T extends Promise<infer U> ? U : T; type A = P<Promise<'ok'>>; // 'ok' type B = P<number>; // number
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`for…in` exists but is not ideal for arrays—it iterates enumerable keys (including custom properties) as strings. Prefer `for`, `for…of`, or `Array.prototype.forEach` for arrays.
const arr = [10, 20, 30];
for (const v of arr) {/* values */}
arr.forEach(v => {/* values */});
for (let i = 0; i < arr.length; i++) {/* indices */}
// for...in iterates keys as strings; avoid for numeric arrays