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Overview
Syllabus
- Hello World
- Exercism's classic introductory exercise. Just say "Hello, World!".
- High Scores
- Manage a player's High Score list.
- Leap
- Determine whether a given year is a leap year.
- Raindrops
- Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.
- 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.".
- Collatz Conjecture
- Calculate the number of steps to reach 1 using the Collatz conjecture.
- Complex Numbers
- Implement complex numbers.
- 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.
- Grains
- Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
- 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.
- Micro Blog
- Given an input string, truncate it to 5 characters.
- Nucleotide Count
- Given a DNA string, compute how many times each nucleotide occurs in the string.
- 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 Duo
- Convert color codes, as used on resistors, to a numeric value.
- RNA Transcription
- Given a DNA strand, return its RNA complement.
- Robot Simulator
- Write a robot simulator.
- Roman Numerals
- Convert modern Arabic numbers into Roman numerals.
- 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.
- 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.
- Allergies
- Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
- Armstrong Numbers
- Determine if a number is an Armstrong number.
- 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.
- Bob
- Bob is a lackadaisical teenager. In conversation, his responses are very limited.
- Clock
- Implement a clock that handles times without dates.
- Crypto Square
- Implement the classic method for composing secret messages called a square code.
- Diamond
- Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
- ETL
- Change the data format for scoring a game to more easily add other languages.
- Hamming
- Calculate the Hamming distance between two DNA strands.
- ISBN Verifier
- Check if a given string is a valid ISBN-10 number.
- Largest Series Product
- Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
- 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.
- Nth Prime
- Given a number n, determine what the nth prime is.
- Pangram
- Determine if a sentence is a pangram.
- Pascal's Triangle
- Compute Pascal's triangle up to a given number of rows.
- Phone Number
- Clean up user-entered phone numbers so that they can be sent SMS messages.
- Protein Translation
- Translate RNA sequences into proteins.
- Pythagorean Triplet
- Given an integer N, find all Pythagorean triplets for which a + b + c = N.
- 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.
- Reverse String
- Reverse a given string.
- Rotational Cipher
- Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
- Saddle Points
- Detect saddle points in a matrix.
- Say
- Given a number from 0 to 999,999,999,999, spell out that number in English.
- Sieve
- Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
- 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.
- Square Root
- Given a natural radicand, return its square root.
- Strain
- Implement the `keep` and `discard` operation on collections.
- Transpose
- Take input text and output it transposed.
- Word Count
- Given a phrase, count the occurrences of each word in that phrase.
- Yacht
- Score a single throw of dice in the game Yacht.
- Affine Cipher
- Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.
- Anagram
- Given a word and a list of possible anagrams, select the correct sublist.
- Binary Search Tree
- Insert and search for numbers in a binary tree.
- Custom Set
- Create a custom set type.
- 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.
- 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'.
- Meetup
- Calculate the date of meetups.
- OCR Numbers
- Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
- 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.
- Run-Length Encoding
- Implement run-length encoding and decoding.
- Variable Length Quantity
- Implement variable length quantity encoding and decoding.
- All Your Base
- Convert a number, represented as a sequence of digits in one base, to any other base.
- Circular Buffer
- A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.
- Error Handling
- Implement various kinds of error handling and resource management.
- Flatten Array
- Take a nested list and return a single list with all values except nil/null.
- Killer Sudoku Helper
- Write a tool that makes it easier to solve Killer Sudokus
- 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.
- Rail Fence Cipher
- Implement encoding and decoding for the rail fence cipher.
- Acronym
- Convert a long phrase to its acronym.
- 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.
- Go Counting
- Count the scored points on a Go board.
- Gigasecond
- Given a moment, determine the moment that would be after a gigasecond has passed.
- List Ops
- Implement basic list operations.
- Luhn
- Given a number determine whether or not it is valid per the Luhn formula.
- Palindrome Products
- Detect palindrome products in a given range.
- Rational Numbers
- Implement rational numbers.
- Tournament
- Tally the results of a small football competition.
- 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.
- Bowling
- Score a bowling game.
- Pig Latin
- Implement a program that translates from English to Pig Latin.
- Poker
- Pick the best hand(s) from a list of poker hands.
- Wordy
- Parse and evaluate simple math word problems returning the answer as an integer.
- Zebra Puzzle
- Solve the zebra puzzle.
- Alphametics
- Given an alphametics puzzle, find the correct solution.
- 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.
- REST API
- Implement a RESTful API for tracking IOUs.
- Forth
- Implement an evaluator for a very simple subset of Forth.
- SGF Parsing
- Parsing a Smart Game Format string.
