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🔷 TypeScript Foundations

JavaScript with types — catch bugs before they run.

1
Lesson 1 — Basic types
basics · 6 min
→2
Lesson 2 — Typed functions
easy · 8 min
→3
Lesson 3 — Interfaces
medium · 9 min
→4
Lesson 4 — Typed arrays
medium · 8 min
→5
Lesson 5 — Union types
medium · 9 min
→6
Lesson 6 — Generics
hard · 11 min
→7
Lesson 7 — Unions & narrowing
medium · 9 min
→8
Lesson 8 — Interfaces
medium · 9 min
→9
Lesson 9 — Type aliases
medium · 8 min
→10
Lesson 10 — Generics
hard · 11 min
→11
Lesson 11 — Generic constraints
hard · 11 min
→12
Lesson 12 — Utility types
hard · 11 min
→13
Lesson 13 — Enums
medium · 8 min
→14
Lesson 14 — Readonly & tuples
medium · 9 min
→15
Lesson 15 — Discriminated unions
hard · 12 min
→16
Lesson 16 — Optional params
medium · 8 min
→