TypeScript Interview Questions and Answers
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Ques 16. How do you use optional parameters in TypeScript?
Optional parameters in TypeScript are denoted by adding a '?' after the parameter name in the function declaration.
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Ques 17. What is the purpose of the 'never' type in TypeScript?
The 'never' type in TypeScript represents values that never occur, such as functions that always throw exceptions or never return.
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Ques 18. How does TypeScript achieve type inference?
TypeScript uses a mechanism called type inference to automatically determine and assign types to variables based on their values and usage.
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Ques 19. What is the 'readonly' modifier in TypeScript?
The 'readonly' modifier in TypeScript is used to make properties of an object immutable after their initial assignment.
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Ques 20. Explain the concept of union types in TypeScript.
Union types in TypeScript allow a variable to hold values of multiple types, separated by the '|' symbol.
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