exercises
Exercises for the Haskell Beginners 2022 course. The course itself can be found here:
This repository contains a complete Haskell project. The project
comprises four Haskell files (modules) in the src/
directory. Each
module provides exercises for an individual lecture and has the
corresponding name (e.g. Lecture1.hs
).
Deadlines
These exercises were created specifically for the Haskell Beginners 2022 course. You can expect to get feedback on your solutions if you meet the following deadlines:
Lecture1.hs
: Jan 17, 2022, 23:59:59 GMTLecture2.hs
: Jan 24, 2022, 23:59:59 GMTLecture3.hs
: Jan 31, 2022, 23:59:59 GMTLecture4.hs
: Feb 7, 2022, 23:59:59 GMT
Working with the course
This section contains instructions about setting up the development environment and preparing the exercises repository.
First time
-
Enable GitHub Actions for your forked repository.
- Visit:
https://github.com/<YOUR_GITHUB_USERNAME>/exercises/actions
- Visit:
-
Clone your forked repository.
-
Enter the
exercises
directory and add the original repository as acourse
remote.git remote add course https://github.com/haskell-beginners-2022/exercises
You can verify that everything is done correctly by running the
git remote -v
command. The output of this command will look similar to the below:course https://github.com/haskell-beginners-2022/exercises (fetch) course https://github.com/haskell-beginners-2022/exercises (push) origin git@github.com:chshersh/exercises.git (fetch) origin git@github.com:chshersh/exercises.git (push)
Asking for feedback
Implement your solutions in a separate branch (not main
). You can
run the following command to create a new branch and switch to it at
the same time:
git checkout -b lecture-1-solutions
When you have finished implementing exercises for a particular lecture, create a Pull Request to your fork. The repository already contains PR template with the prefilled text and mentions all current mentors of the course.
βΉοΈNOTE: Open Pull Request to your fork and not this repository. We can't merge solutions to this repo. But if you open PRs to your repository, you can eventually merge all the solutions and enjoy green all-passing CI π
To open a PR to your fork, you need to change base repository to your own repository, as shown on the screenshot below:
After you change, the PR view will change accordingly:
Updating your fork
The course content (exercises, tests, configuration, etc.) might change after you forked the course. To get the latest updates, follow the below instructions:
-
Switch to your
main
branch locally and make sure it's in sync with the latest version of your fork on GitHub.git checkout main git pull --rebase --prune
-
Fetch all the course changes and save them locally.
git fetch course main git rebase course/main
NOTE: This stage may require you to resolve conflicts.
-
Push local changes to your own fork.
git push origin main --force
Installing Haskell
Follow the below instructions to configure the Haskell development environment.
Haskell Toolchain
To develop in Haskell, you need to install ghcup
, ghc
and cabal
.
-
Install ghcup and follow
ghcup
instructions for successful installation (remember to restart your terminal afterwards to avoid anunknown ghcup command
error on the next step). -
Install the recommended version of the Haskell compiler β GHC β and the Cabal build tool. After you install
ghcup
, it is easy to install the rest with a few commands from your terminal, if these tools are not yet installed.ghcup install ghc 8.10.7 ghcup set ghc 8.10.7 ghcup install cabal 3.6.2.0
You can verify that everything is installed correctly by running the following commands:
$ ghc --version The Glorious Glasgow Haskell Compilation System, version 8.10.7 $ cabal --version cabal-install version 3.6.2.0 compiled using version 3.6.2.0 of the Cabal library
-
Run
cabal update
to fetch the latest info about Haskell packages.
Haskell IDE
If you don't have any IDE preferences, we recommend installing Visual Studio Code with the Haskell plugin. The mentioned plugin would give you everything required to immediately start coding with Haskell.
Gitpod
Instead of configuring a local setup, you can also use Gitpod, a VSCode-based Web IDE.
Click the button below. A workspace with Haskell environment will be created.
To use it on your forked repo, edit the 'Open in Gitpod' button url to https://gitpod.io/#https://github.com/<my-github-username>/exercises
How to build and test?
There're two ways to build this project: using either cabal
or
stack
build tools. Using cabal
is the recommended way. However, if
it doesn't work, you may want to use stack
.
Cabal
To compile the entire project, run the following command from your terminal:
make build
To run tests for a specific lecture only (e.g. the first one), use the following command:
make test-lecture1
You can also run tests only for a single function. For example, to run
tests for the strSum
function, execute the following command:
cabal run exercises-test --enable-tests -- -m "strSum"
Stack
Use the official stack
installation instructions to install stack
.
To build the project with stack
, run the following command:
stack build --test --no-run-tests
To run tests for the first lecture, run the following commands:
stack test :doctest-lecture1
stack test :exercises-test --test-arguments='-m "Lecture 1"'
And to tests a specific function, use:
stack test :exercises-test --test-arguments='-m "strSum"'
Acknowledgement
This course is inspired by Learn4Haskell authored by @vrom911 and @chshersh.