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TypeScript 面试题与答案

相关差异对比

JavaScript vs TypeScript

问题 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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问题 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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问题 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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问题 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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问题 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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