Haskell

Code written in Haskell is guaranteed to have no side effects ... because no one will ever run it? -- XKCD 1312

Install Haskell

Homebrew

Paste the following command to your Terminal window:

brew install ghc cabal-install haskell-stack haskell-language-server

This make take a while to install all necessary Haskell components. Once finished, let's test your installation:

1. Type ghci in terminal. This will open Prelude - Haskell's interactive shell.
2. Type 2022 + 1 and hit Enter.
3. Enjoy Haskell telling you the current year! Woooah! 🥳

tip

To close Prelude, simply hit Ctrl+D. Just like in Python!

GHCup (officially supported)

We need to install GHCup, which includes all necessary components to execute Haskell code. Run the following command in a Terminal window:

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

Once you see the message "Welcome to Haskell!", you'll be prompted about updating your $PATH variable, installing HLS and better integration with GHCup. Please choose all the default values:

The download and installation may take a couple of minutes. Once all components are installed, test your Haskell by launching its interactive shell with ghci and typing 1 + 1:

Get VS Code extension

JetBrains do not have an IDE for Haskell, but VS Code works very well with the official Haskell extension!

tip

Cool! You're all set to start your journey with functional programming. Psst... There is a pretty good online guide to Haskell: Learn You A Haskell for Great Good! 📚