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

Binary Search

Implement a binary search algorithm.

Flatten Array

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

Two Fer

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

Circular Buffer

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

Protein Translation

Translate RNA sequences into proteins.

React

Implement a basic reactive system.

Transpose

Take input text and output it transposed.

Tournament

Tally the results of a small football competition.

Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'

Poker

Pick the best hand(s) from a list of poker hands.

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.

Rectangles

Count the rectangles in an ASCII diagram.

Two Bucket

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

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Markdown

Refactor a Markdown parser

Proverb

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

Word Search

Create a program to solve a word search puzzle.

Error Handling

Implement various kinds of error handling and resource management

Grep

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

Reverse String

Reverse a string

Scale Generator

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

Armstrong Numbers

Determine if a number is an Armstrong number

Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

Tree Building

Refactor a tree building algorithm.

Hangman

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

Ledger

Refactor a ledger printer.

Paasio

Report network IO statistics