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Best resources to learnFunctional Programming & Haskell

Study sheet

Functional programming builds software from pure functions and immutable data; Haskell is its purest mainstream language. You will learn types, higher-order functions, monads and how FP ideas transfer to any language.

8 resources · · How we curate

🎓Courses(3)

course

Category Theory

Recorded lecture series by Bartosz Milewski introducing category theory for programmers: categories, morphisms, initial and terminal objects, products and coproducts, functors, exponentials, natural transformations and monads, illustrated with Haskell. Viewers learn to connect categorical constructions to type systems and functional programming.

intermediate🇬🇧
course

Haskell MOOC (University of Helsinki)

Two-part self-paced functional programming course from the University of Helsinki, worth 10 ECTS credits. Exercises are automatically checked against test suites, and the material is actively maintained against current GHC and Stack.

beginner🇬🇧
course

CIS 194: Introduction to Haskell (Spring 2013)

Penn's twelve-week Haskell course by Brent Yorgey, with lecture notes and graded homework covering algebraic data types, type classes, laziness, folds, monoids, functors, applicatives and monads. Tooling references predate modern Cabal and Stack.

beginner🇬🇧

📚Books(3)

bookPaid

Effective Haskell: Solving Real-World Problems with Strongly Typed Functional Programming

Rebecca Skinner's 668-page 2023 book on writing production Haskell, covering monad transformers, type families, concurrency, database access and RESTful services. The most current major Haskell book, written against modern GHC extensions and tooling.

intermediate🇬🇧
bookPaid

Programming in Haskell (2nd Edition)

Graham Hutton's Cambridge University Press textbook, second edition, building Haskell from first principles through 120 exercises. Covers type classes, recursion, folds, monads, reasoning about programs and a compiler case study. The author's site hosts free lecture videos and slides.

intermediate🇬🇧
book

Category Theory for Programmers (free PDF edition)

Bartosz Milewski's category theory course for working programmers, as a free typeset PDF with Haskell, Scala, OCaml and Reason editions. Covers functors, natural transformations, Kleisli categories, monads as monoids in endofunctor categories, free monads and comonads.

intermediate🇬🇧

🌐Websites(2)

website

Learn You a Haskell for Great Good! (Community Version)

Community-maintained fork of Miran Lipovaca's introductory Haskell text, forked with the author's permission and updated as the language evolves. Covers types, type classes, recursion, higher-order functions, functors, applicatives and monads. Conceptual rather than project-oriented.

beginner🇬🇧
website

Typeclassopedia

Brent Yorgey's reference to Haskell's standard type class hierarchy, covering Functor, Applicative, Monad, Monoid, Foldable, Traversable, Category, Arrow and Comonad with their laws, intuitions, exercises and primary references. Readers understand how the classes relate and why their laws matter.

intermediate🇬🇧
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Frequently Asked Questions

What are the best free resources to learn Functional Programming & Haskell?

Dantes has curated 8 resources for Functional Programming & Haskell, including 3 books, 3 courses, 2 websites. All resources are hand-picked for quality — no algorithmic filler. Browse the full list above to find the format that works best for you.

Is Functional Programming & Haskell hard to learn?

Functional Programming & Haskell is approachable at the beginner level — there are resources here specifically for those starting from scratch. As you progress, intermediate and advanced material is also available to take your skills further.

What types of Functional Programming & Haskell learning resources are available on Dantes?

For Functional Programming & Haskell, Dantes has curated 3 books, 3 courses, 2 websites. Each resource type serves a different learning style: videos and YouTube for visual learners, books for depth, courses for structured progression, and websites for quick reference.

How does Dantes select Functional Programming & Haskell resources?

Dantes is an algorithm-free learning directory. Resources are hand-curated based on quality, accuracy, and usefulness — not engagement metrics or paid placements. The goal is to surface the best learning material for Functional Programming & Haskell, whether it's a free YouTube series, a classic textbook, or an open courseware from a top university.

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