SCRIPTING

TYPESCRIPT Interview Questions

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Curriculum

Topic

01 - What is TypeScript, and what advantages does it give over plain JavaScript2:00
02 - What is the difference between any, unknown, and never, and when would you use each1:54
03 - What is the difference between an interface and a type alias When would you pick one over the other2:07
04 - What are union () and intersection (&) types, and when would you use each2:00
05 - What is type inference, and when should you add explicit type annotations anyway2:00
06 - What is the difference between null, undefined, and what does strictNullChecks change1:53
07 - What are literal types, and how do they enable safer code1:51
08 - What is the difference between unknown and any in terms of type safety, and why is unknown preferred1:49
09 - What is the readonly modifier, and how does it differ from const1:54
10 - What are optional chaining (.) and nullish coalescing (), and how do they differ from1:58
11 - What is function overloading in TypeScript, and how do you declare overloads1:59
12 - What are optional, default, and rest parameters in a typed function2:03
13 - What is the difference between void and never as a function return type1:56
14 - How do you type a function that takes a callback What is the type of a function value1:57
15 - What does the this parameter type do in a function signature1:51
16 - What is structural typing (duck typing), and how does it differ from nominal typing2:03
17 - What is an index signature, and when would you use RecordK, V instead1:55
18 - What is type narrowing, and how does control-flow analysis enable it2:01
19 - What are the built-in type guards (typeof, instanceof, in), and when do you use each2:19
20 - What is a user-defined type guard (a function returning arg is Type), and why is it useful1:55