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Learn Haskell
in 5 Days

Pure functions, strong types, monads, and IO — functional programming that changes how you think.

5 lessons
Self-paced
~60 min/day
Free forever
No account needed
Start Day 1 — Free → See what's covered
What you'll learn

Haskell in 5 Days

Free 5-day Haskell course. Pure functions, type system, monads, IO, and practical functional programming.

  • Write pure functions and understand referential transparency and immutability
  • Use Haskell's strong type system: type inference, algebraic data types, type classes
  • Understand Maybe and Either for safe null/error handling without exceptions
  • Demystify monads: IO monad, do-notation, and why monads are just a design pattern
  • Build a practical Haskell program: a CLI tool or simple web server with Scotty
Pure
functions
Strong
type system
Monads
demystified
$0
cost
5-Day Curriculum

Every lesson builds on the last.
No theory without practice.

01
Pure Functions and Types
Referential transparency, type inference, basic syntax
pure functionstype inferenceghcistack
→
02
Algebraic Data Types
data, newtype, Maybe, Either, pattern matching
datanewtypeMaybepattern matching
→
03
Type Classes
Eq, Ord, Show, Functor, Foldable — defining your own
type classinstanceFunctorFoldable
→
04
Monads and IO
IO monad, do-notation, Maybe monad, Either monad
IO monaddo-notationbind>>=
→
05
Practical Haskell
Building a CLI tool or web API with Scotty/Warp
ScottyWarpcabalstack
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems at scale. Every lesson has concrete examples and exercises you can finish in under an hour.

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