How do you create a conditional type in TypeScript?

Description : Conditional types use 'extends' to choose between types.

Answer :

Conditional types in TypeScript use the 'extends' keyword to choose between types based on a condition. For example, 'type IsString<T> = T extends string ? 'Yes' : 'No';' defines a conditional type 'IsString' that evaluates to 'Yes' if 'T' is a 'string', otherwise 'No'. Conditional types are useful for creating types that adapt based on certain conditions and help manage complex type logic.

Conditional types in TypeScript use the 'extends' keyword to choose between types based on a condition. For example, 'type IsString<T> = T extends string ? 'Yes' : 'No';' defines a conditional type 'IsString' that evaluates to 'Yes' if 'T' is a 'string', otherwise 'No'. Conditional types are useful for creating types that adapt based on certain conditions and help manage complex type logic.

Category : Typescript

Created Date : 9/6/2024

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What is TypeScript?

What is TypeScript?

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2024-09-09 last updatedFreeTypescript

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.

TypeScript is a statically typed language that builds on JavaScript by adding optional types. It allows developers to catch errors at compile time rather than runtime, which can help improve code quality and readability. TypeScript code is transpiled to JavaScript, making it compatible with existing JavaScript codebases and environments.