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The Missing Manual
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Practice

TypeScript Practice

Basic

Hands-on TypeScript lessons - add types to real JavaScript, run them instantly, and get checked by real tests.

Lessons

  1. Type annotations
  2. Interfaces
  3. Function types and default params
  4. Union types and narrowing
  5. Generics
  6. Capstone: typed inventory lookup
  7. Fix the bug: sorting numbers
  8. Narrowing with in and instanceof
  9. Discriminated unions
  10. Exhaustiveness with never
  11. Generic constraints
  12. A generic class (capstone)