Haskell Tutorial (In Progress)

My record with studying Learn You a Haskell for Great Good!; will be a Haskell Tutorial in future

Chapter

1. Introduction
2. Starting Out
3. Types and Typeclasses
4. Syntax in Functions
5. Recursion
6. Higer Order Functions
7. Module
8. Making Our Own Types and Typeclasses
9. Input and Output
10. Functionally Solving Problems
11. Functiors, Applicative Functors and Monoids
12. A Fistful of Monads
13. For a Few Monads More
14. Zippers

Installation

Linux and macOS

Install GHCup

curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh

First Haskell Program

Create a new file named hello.hs.Write the following in it:

main :: IO ()
main = do
  putStrLn "Hello, everybody!"
  putStrLn ("Please look at my favorite odd numbers: " ++ show (filter odd [10..20]))

GHC

You can now compile ith with ghc to produce an executable .

$ ghc hello.hs

Here the hello.o is exactly the same as C's object files; the hello.hi file is an interface file; you could say that the .hi file is the equivalent of C's header files.

$ ls

hello  hello.hi  hello.hs  hello.o

Let's run the executable file

$ ./hello

Hello, everybody!
Please look at my favorite odd numbers: [11,13,15,17,19]

GHCI

$ ghci hello.hs

GHCi, version 9.2.5: https://www.haskell.org/ghc/  :? for help
[1 of 1] Compiling Main             ( hello.hs, interpreted )
Ok, one module loaded.
ghci> main
Hello, everybody!
Please look at my favorite odd numbers: [11,13,15,17,19]
ghci> :quit
Leaving GHCi.