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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 — Unions & narrowing
medium · 9 min
→7
Lesson 7 — Interfaces
medium · 9 min
→8
Lesson 8 — Type aliases
medium · 8 min
→9
Lesson 9 — Enums
medium · 8 min
→10
Lesson 10 — Readonly & tuples
medium · 9 min
→11
Lesson 11 — Optional params
medium · 8 min
→12
Lesson 12 — Narrowing with in
medium · 8 min
→13
Lesson 13 — Function overloads
medium · 9 min
→14
Lesson 14 — Generics
hard · 11 min
→15
Lesson 15 — Generics
hard · 11 min
→16
Lesson 16 — Generic constraints
hard · 11 min
→17
Lesson 17 — Utility types
hard · 11 min
→18
Lesson 18 — Discriminated unions
hard · 12 min
→19
Lesson 19 — keyof & indexed access
hard · 10 min
→20
Lesson 20 — Mapped types
hard · 11 min
→21
Lesson 21 — Conditional types
hard · 12 min
→22
Lesson 22 — Template literal types (expert)
hard · 12 min
→23
Lesson 23 — Recursive types
very hard · 14 min
→24
Lesson 24 — Exhaustive checks with never
very hard · 15 min
→25
Lesson 25 — Ultimate: typed event emitter
★ ultimate · 18 min
→