keyof Operator
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What is keyof Operator?
The keyof operator in TypeScript creates a union of all the keys (property names) of a given object type. It essentially extracts the names of the properties as string literal types. This allows you to work with the properties of an object type in a type-safe way, especially when dealing with generic functions or situations where you need to ensure that you're only accessing valid properties.
Free resources to learn keyof Operator
- Official docskeyof Type Operator
More in stage 5: Combining Types
keyof Operator: common questions
Can I learn keyof Operator in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain keyof Operator in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this keyof Operator tutorial for beginners?
It is lesson 35 of 93 in the free TypeScript roadmap, in stage 5, Combining Types. If you are new to TypeScript, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.