Learning Haskell

Some random exercises I perform in order to get a better grasp on Haskell.

Goals:

• readable code
• type-driven development
• real-world cases, not some abstract mumbo-jumbo

Running it

Just do runhaskell x to run an exercise in the main folder; for example:

E:\Dev\haskell\learning>runhaskell "0003 Sudoku.hs"
Sudoku solver by @ToJans

|-----------------------|
| 4 . 3 | 1 . . | 9 . 8 |
| . 2 9 | . . . | 4 5 . |
| 1 7 . | 8 4 9 | . . . |
|-----------------------|
| . 4 . | . 2 . | . . . |
| . 9 . | 4 . 7 | . 3 . |
| . . . | . 3 . | . 8 . |
|-----------------------|
| . . . | 5 9 8 | . 4 7 |
| . 5 7 | . . . | 8 6 . |
| 2 . 4 | . . 3 | 5 . 9 |
|-----------------------|

Finding solution
BoardSolved
|-----------------------|
| 4 6 3 | 1 5 2 | 9 7 8 |
| 8 2 9 | 3 7 6 | 4 5 1 |
| 1 7 5 | 8 4 9 | 3 2 6 |
|-----------------------|
| 3 4 8 | 6 2 1 | 7 9 5 |
| 5 9 6 | 4 8 7 | 1 3 2 |
| 7 1 2 | 9 3 5 | 6 8 4 |
|-----------------------|
| 6 3 1 | 5 9 8 | 2 4 7 |
| 9 5 7 | 2 1 4 | 8 6 3 |
| 2 8 4 | 7 6 3 | 5 1 9 |
|-----------------------|


E:\Dev\haskell\learning>

To run exercises in the sub folders, you need to install cabal. Then you just go into the subfolder and type cabal run or cabal repl. If you get an error message about missing dependencies, you should probably run cabal install --dependencies-only.