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TypeScript interview questions

TypeScript interview questions.

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  • 1.

    What is Typescript and why one should use it?

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  • 2.

    What are the benefits of TypeScript?

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  • 3.

    What is TypeScript and why would I use it in place of JavaScript?

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  • 4.

    Explain generics in TypeScript

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  • 5.

    What are Modules in Typescript?

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  • 6.

    List the built-in types in Typescript

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  • 7.

    How to call base class constructor from child class in TypeScript?

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  • 8.

    Do we need to compile TypeScript files and why?

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  • 9.

    What is TypeScript and why do we need it?

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  • 10.

    What is "Decorators" in TypeScript?

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  • 11.

    What is Interface in TypeScript?

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  • 12.

    What is the difference between Classes and Interfaces in Typescript?

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  • 13.

    How to implement class constants in TypeScript?

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  • 14.

    What is getters/setters in TypeScript?

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  • 15.

    Does TypeScript support all object oriented principles?

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  • 16.

    When to use interfaces and when to use classes in TypeScript?

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  • 17.

    How could you check null and undefined in TypeScript?

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  • 18.

    Which object oriented terms are supported by TypeScript?

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  • 19.

    What are the difference beetween Typescript and JavaScript?

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  • 20.

    What is a TypeScript Map file?

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  • 21.

    Could we use TypeScript on backend and how?

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  • 22.

    What is Typings in Typescript?

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  • 23.

    What is the default access modifier for members of a class in TypeScript?

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  • 24.

    Is that TypeScript code valid? Explain why.

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  • 25.

    How TypeScript is optionally statically typed language?

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  • 26.

    How To Use external plain JavaScript Libraries in TypeScript?

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  • 27.

    Does TypeScript supports function overloading?

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  • 28.

    Explain how and why we could use property decorators in TS?

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  • 29.

    What are different components of TypeScript?

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  • 30.

    How can you allow classes defined in a module to accessible outside of the module?

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  • 31.

    What's wrong with that code?

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  • 32.

    Are strongly-typed functions as parameters possible in TypeScript?

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  • 33.

    What is the difference between "interface vs type" statements?

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  • 34.

    What is one thing you would change about TypeScript?

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  • 35.

    Explain when to use "declare" keyword in TypeScript

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  • 36.

    Is it possible to generate TypeScript declaration files from JS library?

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  • 37.

    What are Ambients in TypeScripts and when to use them?

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  • 38.

    Explain why that code is marked as WRONG?

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  • 39.

    How would you overload a class constructor in TypeScript?

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