This repo includes books, exercises, experiments and projects that I did/am doing while learning Haskell. I have also put together a list of resources that have had a positive influence on my journey. I hope this helps anyone who wants to learn Haskell.
There a lot, a lot of bad tutorials / books on Haskell. Some of them don't cover the essentials of the language and the most fundamental libraries and others are very outdated. This list contains useful resources for any level learner.
[Learn You a Haskell for Great good (LYAH)] (http://learnyouahaskell.com/chapters)
- Good book that lacks exercises. Make sure you do CIS194 and H-99 while reading LYAH.
- Outdated book. Only read this if you have more than basic understanding of Haskell. While there are good chapters (the first 4 are best), if you decide to read further, you'll stumble across code that is no longer valid and won't compile. Also, the JSON library chapter can be very boring.
[Ninety-Nine Haskell Problems] (https://wiki.haskell.org/H-99:_Ninety-Nine_Haskell_Problems)
- Do as much of these as you can. Even better, solve this problems whil learning LYAH or RWH.
- This is the most recommended course out there. The lecture notes are small and the exercises are some of the best. I recommend to do this course with a mentor.
[20 Intermediate Haskell Exercises] (http://blog.tmorris.net/posts/20-intermediate-haskell-exercises/)
- These are some very good exercises to do once you think you have figured out typeclasses. Basically, you'll have to write functions based on their types.
- Do a lot of these too. As a beginner, you'll probably be capable of solving the first 10. If you have already solved these in another language, try writing them without looking at your previous work.
While learning Haskell, you might get tired of solving exercises or just want to write some real stuff. For this case, I have put together a list of simple projects. While they're simple, you can improve on them while you learn.
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Create a simple 3x3 TicTacToe
Try to implement the game in Haskell. After you have made it, you can ask someone to review it in the [SO Haskell Chat Room] (http://chat.stackoverflow.com/rooms/83002/haskell-room) or in [Code Review] (http://codereview.stackexchange.com/).
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Implement the game in a more abstract way.
Instead of a 3x3 grid, why not allow the user to choose the size of the board? What about adding capability for more than 2 players playing? Have you already added a function to print the board?
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Make the Connect Four game in Haskell!
This game is very similar to TicTacToe, so you'll find it easier to do one after another. Each time you learn a new function or library, try to apply your knowledge by re-designing certain parts of your code.
There are some pretty awesome stuff you should check when learning Haskell.
GHC Documentation - A must read (especially the ghci chapter).
Hoogle - One of the most pleasant tools if you want more information about a certain function, class, etc.
Cabal - A tool to create packages. You'll probably use this along with Hackage. The user-guide is excellent for learning more about it.
Hspec - A testing framework for Haskell. I recommend checking this out after writing some bigger Haskell programs.
Hackage - This is the most used package archieve among Haskell programmers. A little side note: Don't upload test packages, because they can't be deleted. For testing, use [Package candidates] (https://hackage.haskell.org/packages/candidates/upload).
If you stumble across any problem, or just want help, you can make your questions here:
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IRC Chat (channel #haskell and #haskell-beginners)
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I am currently learning Haskell. I am no expert. That's why the solutions may not be the best. If you find better solutions, please create a pull request or open an issue.
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This list is not permanent, I'll be updating things as the time goes on.
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Do you know about any other good resources or exercises? Open an issue and we'll discuss your suggestions.