What is the difference between 'unknown' and 'any' in TypeScript?

Description : 'unknown' is safer than 'any' as it forces type checking.

Answer :

In TypeScript, 'unknown' is a safer alternative to 'any' because it forces you to perform type checks before using the value. While 'any' allows any operation without type checking, 'unknown' requires you to narrow down the type first. For example, 'let value: unknown; if (typeof value === 'string') { console.log(value.toUpperCase()); }' ensures that the value is treated as a string after the check.

In TypeScript, 'unknown' is a safer alternative to 'any' because it forces you to perform type checks before using the value. While 'any' allows any operation without type checking, 'unknown' requires you to narrow down the type first. For example, 'let value: unknown; if (typeof value === 'string') { console.log(value.toUpperCase()); }' ensures that the value is treated as a string after the check.

Category : Typescript

Created Date : 9/7/2024

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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.