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Literal types and const — Lesson | DistroSource Library

Library / Learning / TypeScript / Module 1: Modelling data

Lesson · Intermediate · 25 min

Literal types and const

Precise types for strings and numbers that are really a fixed set.

typescript
lesson

Inside this lesson

You will: Use literal unions for fixed sets
You will: Derive types from const arrays

Sections: 3
Exercise: Yes

The full lesson opens with a membership that covers TypeScript.

Unions over booleans Narrowing safely

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