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Exercism
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Free Online Course
Languages

English
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On-Demand
Level

Intermediate

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D is a systems programming language with C-like syntax and static typing. It combines efficiency, control and modeling power with safety and programmer productivity. The language was developed originally by Walter Bright and Andrei Alexandrescu since D version 2. D is the culmination of decades of experience implementing compilers for many diverse languages and has a large number of :

Syllabus

Hello World

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

Leap

Determine whether a given year is a leap year.

Raindrops

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

Two-Fer

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

Acronym

Convert a long phrase to its acronym.

Allergies

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

Anagram

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

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

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.

Difference of Squares

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

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.

Gigasecond

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

Hamming

Calculate the Hamming distance between two DNA strands.

Isogram

Determine if a word or phrase is an isogram.

Micro Blog

Given an input string, truncate it to 5 characters.

Pangram

Determine if a sentence is a pangram.

Prime Factors

Compute the prime factors of a given natural number.

Protein Translation

Translate RNA sequences into proteins.

Resistor Color

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

Resistor Color Duo

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

Resistor Color Trio

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

Reverse String

Reverse a given string.

RNA Transcription

Given a DNA strand, return its RNA complement.

Rotational Cipher

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

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.

Space Age

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

Square Root

Given a natural radicand, return its square root.

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.

Armstrong Numbers

Determine if a number is an Armstrong number.

Binary Search

Implement a binary search algorithm.

Bottle Song

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

D&D Character

Randomly generate Dungeons & Dragons characters.

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

Grains

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

ISBN Verifier

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

Kindergarten Garden

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

Line Up

Help lining up customers at Yaʻqūb's Deli.

Luhn

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

Matching Brackets

Make sure the brackets and braces all match.

Nucleotide Count

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

Perfect Numbers

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

Phone Number

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

Proverb

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

Robot Simulator

Write a robot simulator.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Series

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

Sieve

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

Sublist

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

Twelve Days

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

Affine Cipher

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

All Your Base

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

Atbash Cipher

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

Circular Buffer

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

Food Chain

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

House

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

Largest Series Product

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

Matrix

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

Nth Prime

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

Pascal's Triangle

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

Robot Name

Manage robot factory settings.

Crypto Square

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

Grade School

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

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.

Meetup

Calculate the date of meetups.

Pig Latin

Implement a program that translates from English to Pig Latin.

Pythagorean Triplet

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

Run-Length Encoding

Implement run-length encoding and decoding.

State of Tic-Tac-Toe

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

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.

Yacht

Score a single throw of dice in the game Yacht.

Flower Field

Mark all the flowers in a garden.

Conway's Game of Life

Implement Conway's Game of Life.

Intergalactic Transmission

Add parity bits to a message for transmission

Killer Sudoku Helper

Write a tool that makes it easier to solve Killer Sudokus

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

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.