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🟨 JavaScript Intermediate

Closures, async, and the patterns real apps use.

1
Lesson 1 — Destructuring & spread
easy · 8 min
→2
Lesson 2 — Closures
medium · 9 min
→3
Lesson 3 — Promises
medium · 10 min
→4
Lesson 4 — async / await
medium · 10 min
→5
Lesson 5 — Classes
medium · 9 min
→6
Lesson 6 — Spread & rest
medium · 8 min
→7
Lesson 7 — Optional chaining
medium · 8 min
→8
Lesson 8 — Object.entries
medium · 9 min
→9
Lesson 9 — flat & flatMap
medium · 9 min
→10
Lesson 10 — Default & named params
medium · 8 min
→11
Lesson 11 — Nullish & optional deep
medium · 8 min
→12
Lesson 12 — Immutable updates
medium · 9 min
→13
Lesson 13 — reduce
hard · 10 min
→14
Lesson 14 — async / await
hard · 12 min
→15
Lesson 15 — Map & Set
hard · 10 min
→16
Lesson 16 — Promise chaining
hard · 11 min
→17
Lesson 17 — Regular expressions
hard · 11 min
→18
Lesson 18 — Module pattern
hard · 11 min
→19
Lesson 19 — Promise.all
hard · 11 min
→20
Lesson 20 — Generators
hard · 11 min
→21
Lesson 21 — Currying
hard · 11 min
→22
Lesson 22 — Compose & pipe (expert)
hard · 13 min
→23
Lesson 23 — Promisify a callback
very hard · 14 min
→24
Lesson 24 — Concurrency limiter
very hard · 16 min
→25
Lesson 25 — Ultimate: hash router
★ ultimate · 18 min
→