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WithoutBook LIVE Mock Interviews TypeScript Related interview subjects: 19

Interview Questions and Answers

Know the top TypeScript interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 38 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top TypeScript interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Freshers / Beginner level questions & answers

Ques 2

Explain the difference between 'let' and 'const' in TypeScript.

'let' is used to declare variables with block scope, while 'const' is used to declare constants with block scope that cannot be reassigned.
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Intermediate / 1 to 5 years experienced level questions & answers

Ques 17

Explain the concept of static typing in TypeScript.

Static typing in TypeScript involves specifying the data types of variables at compile time, which helps catch type-related errors early in the development process.
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Ques 21

Explain the 'async' and 'await' keywords in TypeScript.

'async' is used to declare an asynchronous function, and 'await' is used to pause the execution of the function until the promise is resolved.
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Ques 29

How do you use the 'as' keyword for type assertions in TypeScript?

The 'as' keyword in TypeScript is used for type assertions, allowing you to tell the compiler that you know more about the type of a value than it does.
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Ques 30

Explain the concept of ambient declarations in TypeScript.

Ambient declarations in TypeScript are used to tell the compiler about the existence of external entities, such as libraries or globals, that are not defined in the current TypeScript file.
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Ques 31

How do you create an instance of an interface in TypeScript?

Interfaces in TypeScript are not directly instantiated. Instead, you can create an object literal that conforms to the shape of the interface.
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Ques 33

Explain the concept of abstract classes in TypeScript.

Abstract classes in TypeScript are classes that cannot be instantiated on their own and are meant to be subclassed. They may contain abstract methods that must be implemented by subclasses.
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Ques 34

What is the purpose of the 'namespace' keyword in TypeScript?

The 'namespace' keyword in TypeScript is used to group related code into a named scope, preventing naming conflicts with other parts of the program.
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Ques 35

How do you use the 'readonly' modifier with arrays and objects?

The 'readonly' modifier in TypeScript can be applied to arrays and objects using 'ReadonlyArray' and 'Readonly' types to make them immutable.
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Experienced / Expert level questions & answers

Ques 38

What is the 'never' type and where is it commonly used?

The 'never' type in TypeScript is used to represent values that never occur. It is commonly used in functions that always throw exceptions or never return.
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JavaScript vs TypeScriptJavaScript vs TypeScript

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