Elixir

via Exercism

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Exercism
Pricing

Free Online Course
Languages

English
Sessions

On-Demand
Level

Beginner

Found in

Elixir, initially released in 2012, extends upon the already robust features of Erlang while also being easier for beginners to access, read, test, and write. José Valim, the creator of Elixir, explains in his 2012 conference talk how he built the language for applications to be: Distributed

Syllabus

Hello World

Exercism's classic introductory exercise. Just say "Hello, World!".

Lasagna

Learn about the basics of Elixir by following a lasagna recipe.

Pacman Rules

Learn about booleans by implementing the rules of the Pac-Man game.

Freelancer Rates

Learn about integers and floating point numbers by helping a freelancer communicate with a project manager about billing.

Secrets

Learn about bit manipulation and anonymous functions by writing the software for an encryption device.

Log Level

Learn about atoms and the cond conditional expression by aggregating application logs.

Language List

Learn about lists by keeping track of the programming languages you're currently learning on Exercism.

Guessing Game

Learn about multiple clause functions, guards, and default arguments by implementing a simple game in which the player needs to guess a secret number.

Kitchen Calculator

Learn about tuples and pattern matching by converting common US baking measurements to the metric system.

High School Sweetheart

Learn about strings and the pipe operator by helping high school sweethearts profess their love on social media via ASCII art.

Bird Count

Learn about recursion by keeping track of how many birds visit your garden each day.

High Score

Learn about maps by keeping track of the high scores in your local arcade hall.

City Office

Learn about writing documentation and typespecs by getting your code ready for the arrival of a new colleague at the city office.

German Sysadmin

Learn about charlists and the case conditional expression by sanitizing usernames of employees in a German company.

RPG Character Sheet

Learn about IO (input/output) by guiding your friends through the character creation process for your pen-and-paper role-playing game.

Name Badge

Learn about nil and the if conditional expression by printing name badges for factory employees.

Take-A-Number

Learn about processes and process identifiers by writing an embedded system for a Take-A-Number machine.

Wine Cellar

Learn about keyword lists by providing wine suggestions to the customers in your restaurant.

Paint By Number

Learn about bitstrings by creating binary files with pictures for a paint-by-number app.

DNA Encoding

Learn about bitstrings and tail call recursion by encoding DNA sequences as binary data.

Library Fees

Learn about dates and time by calculating late fees for the local library.

Basketball Website

Learn about Access Behaviour by helping extract deeply nested data for the basketball team's website.

Boutique Inventory

Learn about the Enum module by preparing your fashion boutique for the big annual sale.

File Sniffer

Learn about binaries by verifying the mime type of files uploaded to your server.

Newsletter

Learn about working with files by sending out a newsletter.

Chessboard

Learn about ranges by generating a chessboard.

Remote Control Car

Learn about structs by playing around with a remote controlled car.

Boutique Suggestions

Learn about list comprehensions by generating outfit suggestions for the clients of your fashion boutique.

Community Garden

Learn about the Agent module by helping your local community handle community garden registrations.

Bread And Potions

Learn about protocols by developing your own role-playing video game.

Captain's Log

Learn about randomness and using Erlang libraries from Elixir by helping Mary generate stardates and starship registry numbers for her Star Trek themed pen-and-paper role playing sessions.

Need For Speed

Learn about reusing code with alias and import by racing remote controlled cars.

RPN Calculator

Learn about errors and rescuing them by working on an experimental Reverse Polish Notation calculator.

Stack Underflow

Learn about defining custom exceptions by continuing work on your experimental Reverse Polish Notation calculator.

RPN Calculator Inspection

Learn about tasks and links by inspecting a working prototype of your experimental Reverse Polish Notation calculator.

Lucas Numbers

Learn about streams by generating the Lucas number sequence.

New Passport

Learn about `with` to concentrate on the happy path and manage a stressful day of facing bureaucracy.

Top Secret

Learn about the Abstract Syntax Tree (AST) by helping decode secret messages from Agent Ex.

Dancing Dots

Learn about behaviours by writing animations for dot-based generative art.

Take-A-Number Deluxe

Learn about GenServers by writing an embedded system for a Take-A-Number machine.

Log Parser

Learn about regular expressions by parsing logs.

Gotta Snatch'Em All

Learn to use sets by playing a vintage trading card game

Resistor Color

Convert a resistor band's color to its numeric representation.

Two Fer

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

Acronym

Convert a long phrase to its acronym.

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.

Anagram

Given a word and a list of possible anagrams, select the correct sublist.

Armstrong Numbers

Determine if a number is an Armstrong number.

Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture.

Darts

Calculate the points scored in a single toss of a Darts game.

Change the data format for scoring a game to more easily add other languages.

Hamming

Calculate the Hamming distance between two DNA strands.

Line Up

Help lining up customers at Yaʻqūb's Deli.

Nth Prime

Given a number n, determine what the nth prime is.

Nucleotide Count

Given a DNA string, compute how many times each nucleotide occurs in the string.

Pangram

Determine if a sentence is a pangram.

Pig Latin

Implement a program that translates from English to Pig Latin.

Protein Translation

Translate RNA sequences into proteins.

Raindrops

Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.

Resistor Color Duo

Convert color codes, as used on resistors, to a numeric value.

RNA Transcription

Given a DNA strand, return its RNA complement.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Rotational Cipher

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.

Run-Length Encoding

Implement run-length encoding and decoding.

Scrabble Score

Given a word, compute the Scrabble score for that word.

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

Series

Given a string of digits, output all the contiguous substrings of length `n` in that string.

Space Age

Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.

Strain

Implement the `keep` and `discard` operation on collections.

Sublist

Write a function to determine if a list is a sublist of another list.

Sum of Multiples

Given a number, find the sum of all the multiples of particular numbers up to but not including that number.

Triangle

Determine if a triangle is equilateral, isosceles, or scalene.

Atbash Cipher

Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.

Binary Search

Implement a binary search algorithm.

Binary Search Tree

Insert and search for numbers in a binary tree.

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Bottle Song

Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.

D&D Character

Randomly generate Dungeons & Dragons characters.

Eliud's Eggs

Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.

Flatten Array

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

Gigasecond

Given a moment, determine the moment that would be after a gigasecond has passed.

Grade School

Given students' names along with the grade that they are in, create a roster for the school.

Grains

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.

House

Output the nursery rhyme 'This is the House that Jack Built'.

ISBN Verifier

Check if a given string is a valid ISBN-10 number.

Isogram

Determine if a word or phrase is an isogram.

Kindergarten Garden

Given a diagram, determine which plants each child in the kindergarten class is responsible for.

Leap

Determine whether a given year is a leap year.

Matching Brackets

Make sure the brackets and braces all match.

Matrix

Given a string representing a matrix of numbers, return the rows and columns of that matrix.

Pascal's Triangle

Compute Pascal's triangle up to a given number of rows.

Perfect Numbers

Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.

Prime Factors

Compute the prime factors of a given natural number.

Proverb

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

Resistor Color Trio

Convert color codes, as used on resistors, to a human-readable label.

Given a number from 0 to 999,999,999,999, spell out that number in English.

Simple Cipher

Implement the Vigenère cipher, a simple substitution cipher.

Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'.

Word Count

Given a phrase, count the occurrences of each word in that phrase.

Allergies

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.

Complex Numbers

Implement complex numbers.

Crypto Square

Implement the classic method for composing secret messages called a square code.

Difference of Squares

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.

Dominoes

Make a chain of dominoes.

Grep

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

Killer Sudoku Helper

Write a tool that makes it easier to solve Killer Sudokus

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.

Meetup

Calculate the date of meetups.

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Phone Number

Clean up user-entered phone numbers so that they can be sent SMS messages.

Rational Numbers

Implement rational numbers.

Simple Linked List

Write a simple linked list implementation that uses Elements and a List.

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Tournament

Tally the results of a small football competition.

Affine Cipher

Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.

Bank Account

Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!

Clock

Implement a clock that handles times without dates.

Custom Set

Create a custom set type.

Diamond

Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.

Intergalactic Transmission

Add parity bits to a message for transmission

Luhn

Given a number determine whether or not it is valid per the Luhn formula.

Palindrome Products

Detect palindrome products in a given range.

Pythagorean Triplet

Given an integer N, find all Pythagorean triplets for which a + b + c = N.

Saddle Points

Detect saddle points in a matrix.

Sieve

Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.

Split-Second Stopwatch

Keep track of time through a digital stopwatch.

Square Root

Given a natural radicand, return its square root.

Transpose

Take input text and output it transposed.

Yacht

Score a single throw of dice in the game Yacht.

Baffling Birthdays

Estimate the birthday paradox's probabilities.

Camicia

Simulate the card game and determine whether the match ends or enters an infinite loop.

Game of Life

Implement Conway's Game of Life.

Knapsack

Given a knapsack that can only carry a certain weight, determine which items to put in the knapsack in order to maximize their combined value.

Ledger

Refactor a ledger printer.

List Ops

Implement basic list operations.

Markdown

Refactor a Markdown parser.

OCR Numbers

Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.

Prism

Calculate the path of a laser through refractive prisms.

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

Relative Distance

Given a family tree, calculate the degree of separation.

Robot Simulator

Write a robot simulator.

Satellite

Rebuild binary trees from pre-order and in-order traversals.

State of Tic-Tac-Toe

Determine the game state of a match of Tic-Tac-Toe.

Swift Scheduling

Convert delivery date descriptions to actual delivery dates.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Alphametics

Given an alphametics puzzle, find the correct solution.

Change

Correctly determine change to be given using the least number of coins.

Connect

Compute the result for a game of Hex / Polygon.

Flower Field

Mark all the flowers in a garden.

Piecing It Together

Fill in missing jigsaw puzzle details from partial data

Queen Attack

Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other.

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.

Word Search

Create a program to solve a word search puzzle.

Wordy

Parse and evaluate simple math word problems returning the answer as an integer.

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.