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22 interview questions on Typescript - Overviewfor developers (2024)

Test your technical skills before an interview of Typescript - Overview with 22 corrected questions. Beginner, Intermediate or Expert level.

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Easy
8 votes902 runs0 comment

Which of the following utility types makes all properties of a given type optional?

Web developer
typescript
types
Vincent Cotroat Mar 29, 2023
Easy
7 votes515 runs0 comment

Create a generic reverseArray function to reverse the elements of an array while maintaining type safety.

Web developer
arrays
functions
type-safety
Enguerranat Sep 6, 2023
Easy
7 votes409 runs1 comment

Import an add function from a TypeScript module math.ts

Web developer
import
module
Lucasat May 30, 2023
Easy
6 votes896 runs0 comment

Define a custom type that represents a coordinate with an x and y property of type number in Typescript

Web developer
typescript
type
Vincent Cotroat Mar 31, 2023
Easy
6 votes853 runs0 comment

Typescript: What is the type of result?

Web developer
typescript
type
Vincent Cotroat Mar 29, 2023
Easy
4 votes956 runs
1 comment

Create a generic identity function that returns the passed value in Typescript

Web developer
functions
generics
Vincent Cotroat Mar 31, 2023
Easy
4 votes878 runs0 comment

Explain the difference between the `any` and `unknown` types in TypeScript.

Web developer
typescript
type
Vincent Cotroat Mar 31, 2023
Easy
4 votes840 runs0 comment

Write a generic interface in Typescript

Web developer
interfaces
generics
Vincent Cotroat Mar 29, 2023
Easy
3 votes872 runs0 comment

Typescript: What is the inferred type of the result variable?

Web developer
type-inference
typescript
Vincent Cotroat Mar 29, 2023
Easy
3 votes863 runs0 comment

Typescript: What is the resulting type of MyType in the following TypeScript code?

Web developer
typescript
type
Vincent Cotroat Mar 29, 2023
Easy
3 votes859 runs0 comment

Create a utils namespace that contains a Logger class for handling logging.

Web developer
classes
namespaces
Vincent Cotroat Mar 29, 2023
Easy
3 votes843 runs0 comment

Which configuration option in tsconfig.json allows specifying files to include in the compilation?

Web developer
configuration
tsconfig.json
Vincent Cotroat Mar 29, 2023
Easy
3 votes840 runs1 comment

What is the main purpose of generics in TypeScript?

Web developer
generics
type-safety
Vincent Cotroat Mar 29, 2023
Easy
3 votes830 runs0 comment

What file is used to configure TypeScript?

Web developer
configuration
typescript
Vincent Cotroat Mar 29, 2023
Easy
3 votes817 runs0 comment

What is the result of compiling the following TypeScript code?

Web developer
Vincent Cotroat Jan 9, 2024
Easy
2 votes893 runs0 comment

What is the resulting type of Exclude<string | number | boolean, number>?

Web developer
typescript
type
Vincent Cotroat Mar 29, 2023
Easy
2 votes859 runs0 comment

Find the error in the following TypeScript code:

Web developer
typescript
interfaces
classes
Vincent Cotroat Mar 29, 2023
Medium
1 vote371 runs0 comment

What is a tuple in TypeScript?

Web developer
array
type
Jakeat Nov 3, 2023
Easy
1 vote285 runs2 comments

Declare a string type variable in TypeScript

Web developer
typescript
variables
Lucasat May 30, 2023
Easy
0 vote841 runs2 comments

What type of decorator is used to add metadata to a class in Typescript?

Web developer
decorators
metadata
Vincent Cotroat Mar 29, 2023