Installing Haskell

To run Haskell code, you need a Haskell compiler. The Glasgow Haskell Compiler (GHC) is the official implementation of the Haskell platform. You have a couple of options to get ahold of GHC: install it on your local machine or log in to a departmental server.

Having Haskell on your own computer has advantages: you're not relying on a clumsy internet connection, files can be manipulated using your operating system's file explorer, and you can install third-party packages. Install it with GHCup.

Using a server with Haskell already installed also has advantages: you don't have to deal with permissions issues, and you don't waste time waiting for the platform to download and compile. Haskell is already installed on stu, and you don't need to do anything special to make it work. Just log in to stu with your favorite SSH client or SSH-powered editor.

Once you have access to GHC, run a Haskell program from the command line like this:

runhaskell path/to/my/script.hs

If you want to run Haskell code interactively, run ghci like this:

ghci

Use :l script.hs to load functions and variables from a file in the current directory. If you make modifications to the file, reload it with :r.