Playing with Haskell
Contents
While I was reading Seven Languages in Seven Weeks 1, I wanted to test Haskell. Just for fun.
Running Haskell
To run Haskell one solution is to use a Docker image. It avoids the burden of installing it on your machine.
To make it even easier, a good old Makefile can help.
# Assuming you have an src folder it will run the image
# and mount the src volume in /root/src
current_dir = $(shell pwd)
image = "haskell"
tag = "8"
image_tag = "${image}:${tag}"
GHCi:
@echo "Running ${image_tag} in console mode ..."
@docker run -v ${current_dir}/src:/root/src -w "/root/src" -it --rm ${image_tag} ghci
Once defined, to run GHCi (stands for Glasgow Haskell Compiler Interactive), just run the make.
$ make
# Running haskell:8 in console mode ...
# Unable to find image 'haskell:8' locally
# 8: Pulling from library/haskell
# 146bd6a88618: Pull complete
# 27eaafd2ddfb: Pull complete
# Digest: sha256:e6b4675835bce283d610179c3ee67840ce9b702745f1f7709c121e07d41e0c5d
# Status: Downloaded newer image for haskell:8
# GHCi, version 8.8.1: https://www.haskell.org/ghc/ :? for help
Prelude>
Playing with it
Now you can start playing.
-- A dumb example
Prelude> double x = x + x
Prelude> double 4
8
Next steps
My advice is to read the great book Learn You a Haskell for Great Good! 2. Even better, it can be read online for free.