Add new Haskell exercises

One of the easiest ways to add new exercises to the Haskell track is to translate them from other language tracks on Exercism. This page lists all of the problem specifications in the common pool of exercises which have not yet been implemented in Haskell.

The icon links to the language-independent description of the problem.

The icon links to the canonical test data.

We also link to all the implementations of each exercise in other languages, which you can use for inspiration.

Once you've picked an exercise, follow the instructions in this guide and submit your pull request to the Haskell track repository on GitHub.

Exercises

About

Examples

Two Fer

Create a sentence of the form "One for X, one for me."

Flatten Array

Take a nested list and return a single list with all values except nil/null

Circular Buffer

A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.

Armstrong Numbers

Determine if a number is an Armstrong number

React

Implement a basic reactive system.

Proverb

For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.

Rectangles

Count the rectangles in an ASCII diagram.

Tournament

Tally the results of a small football competition.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Book Store

To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts of multiple-book purchases.

Diffie Hellman

Diffie-Hellman key exchange.

Two Bucket

Given two buckets of different size, demonstrate how to measure an exact number of liters.

Markdown

Refactor a Markdown parser

Grep

Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.

Scale Generator

Generate musical scales, given a starting note and a set of intervals.

Word Search

Create a program to solve a word search puzzle.

Error Handling

Implement various kinds of error handling and resource management

Rational Numbers

Implement rational numbers.

Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

Tree Building

Refactor a tree building algorithm.

Yacht

Score a single throw of dice in the game Yacht

Hangman

Implement the logic of the hangman game using functional reactive programming.

Ledger

Refactor a ledger printer.

Paasio

Report network IO statistics