Add new Erlang exercises
One of the easiest ways to add new exercises to the Erlang 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 Erlang.
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 Erlang track repository on GitHub.
Convert a long phrase to its acronym
Compute Pascal's triangle up to a given number of rows.
Manage robot factory settings.
Given a number n, determine what the nth prime is.
Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for natural numbers.
Compute the prime factors of a given natural number.
Make sure the brackets and braces all match.
Implement the classic method for composing secret messages called a square code.
Given a number from 0 to 999,999,999,999, spell out that number in English.
Implement a program that translates from English to Pig Latin
Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other.
Run Length Encoding
Implement run-length encoding and decoding.
Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
Take a nested list and return a single list with all values except nil/null
Add the numbers to a minesweeper board
Write a function to determine if a list is a sublist of another list.
Parse and evaluate simple math word problems returning the answer as an integer.
Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
Binary Search Tree
Insert and search for numbers in a binary tree.
Implement basic list operations
Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
Detect saddle points in a matrix.
Correctly determine change to be given using the least number of coins
Check if a given string is a valid ISBN-10 number.
Detect palindrome products in a given range.
There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product a * b * c.
Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'
Given a diagram, determine which plants each child in the kindergarten class is responsible for.
Translate RNA sequences into proteins.
Given a string representing a matrix of numbers, return the rows and columns of that matrix.
Implement a basic reactive system.
Implement a simple shift cipher like Caesar and a more secure substitution cipher
Simple Linked List
Write a simple linked list implementation that uses Elements and a List
Take input text and output it transposed.
Implement an evaluator for a very simple subset of Forth
Write a function to solve alphametics puzzles.
Compute the result for a game of Hex / Polygon
Output the nursery rhyme 'This is the House that Jack Built'.
Output the lyrics to 'The Twelve Days of Christmas'
Make a chain of dominoes.
Rail Fence Cipher
Implement encoding and decoding for the rail fence cipher.
Tally the results of a small football competition.
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.
Pick the best hand(s) from a list of poker hands.
For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.
Given two buckets of different size, demonstrate how to measure an exact number of liters.
Count the rectangles in an ASCII diagram.
Determine if a number is an Armstrong number
Diffie-Hellman key exchange.
Variable Length Quantity
Implement variable length quantity encoding and decoding.
Refactor a Markdown parser
Reparent a graph on a selected node
Create a program to solve a word search puzzle.
Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.
Generate musical scales, given a starting note and a set of intervals.
Implement various kinds of error handling and resource management
Write a Domain Specific Language similar to the Graphviz dot language
Count the scored points on a Go board.
Parsing a Smart Game Format string.
Refactor a tree building algorithm.
Implement the logic of the hangman game using functional reactive programming.
Refactor a ledger printer.
Implement rational numbers.
Report network IO statistics