Extract
Last updated
What is Extract?
Extract allows you to create a new type by picking out specific types from a union based on a condition. Essentially, it filters a union type, keeping only those members that are assignable to a specified type. This is useful when you need to narrow down the possible types in a union to only those that meet a certain criteria.
Free resources to learn Extract
- Official docsExtract<Type, Union>
More in stage 11: Utility Types
Extract: common questions
Can I learn Extract 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 Extract 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 Extract tutorial for beginners?
It is lesson 64 of 93 in the free TypeScript roadmap, in stage 11, Utility 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.