Erlang

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Exercism
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Free Online Course
Languages

English
Sessions

On-Demand
Level

Intermediate

Found in

Erlang is a functional programming language, used for creating real-time distributed systems, which can easily scale in size. It's best for concurrent applications, such as instant messaging and banking platforms, as each function call has their own process and operates independently. This is useful as code can run for a very long time without issues occurring. Also, processes and message passing are all built into the language by default - no need for any extra libraries!

Syllabus

Hello World

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

Two Fer

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

Leap

Determine whether a given year is a leap year.

Accumulate

Implement the `accumulate` operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.

Collatz Conjecture

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

Raindrops

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

RNA Transcription

Given a DNA strand, return its RNA complement.

Acronym

Convert a long phrase to its acronym.

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

Square Root

Given a natural radicand, return its square root.

Strain

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

Hamming

Calculate the Hamming distance between two DNA strands.

Space Age

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

Yacht

Score a single throw of dice in the game Yacht.

Darts

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

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.

Diamond

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

Difference of Squares

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

Series

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

Custom Set

Create a custom set type.

Triangle

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

Prime Factors

Compute the prime factors of a given natural number.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Saddle Points

Detect saddle points in a matrix.

Complex Numbers

Implement complex numbers.

Rational Numbers

Implement rational numbers.

Beer Song

Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.

Anagram

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

Sieve

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

Change

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

Meetup

Calculate the date of meetups.

Palindrome Products

Detect palindrome products in a given range.

Minesweeper

Add the numbers to a minesweeper board.

Dominoes

Make a chain of dominoes.

Armstrong Numbers

Determine if a number is an Armstrong number.

Perfect Numbers

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

Sum of Multiples

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

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Forth

Implement an evaluator for a very simple subset of Forth.

Pascal's Triangle

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

Secret Handshake

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

Allergies

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

Bank Account

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

Poker

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

Connect

Compute the result for a game of Hex / Polygon.

List Ops

Implement basic list operations.

Protein Translation

Translate RNA sequences into proteins.

Scrabble Score

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

All Your Base

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

Spiral Matrix

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

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.

Sublist

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

Largest Series Product

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

Satellite

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

Zipper

Creating a zipper for a binary tree.

ISBN Verifier

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

Run-Length Encoding

Implement run-length encoding and decoding.

Simple Linked List

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

Clock

Implement a clock that handles times without dates.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Luhn

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

Pythagorean Triplet

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

Atbash Cipher

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

Nth Prime

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

Transpose

Take input text and output it transposed.

Word Count

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

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

Circular Buffer

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

Phone Number

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

Robot Simulator

Write a robot simulator.

Rotational Cipher

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

Crypto Square

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

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

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.