Exercises on the Lua Track | Exercism

Hello World

The classical introductory exercise. Just say "Hello, World!"

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optional values

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Hamming

Calculate the Hamming difference between two DNA strands.

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House

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

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Raindrops

Convert a number to a string, the contents of which depend on the number's factors.

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Bob

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

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Difference Of Squares

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

Variable Length Quantity

Implement variable length quantity encoding and decoding.

bitwise operations

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Anagram

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

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Octal

Convert a octal number, represented as a string (e.g. '1735263'), to its decimal equivalent using first principles (i.e. no, you may not use built-in or external libraries to accomplish the conversion).

bitwise operations

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Binary Search

Implement a binary search algorithm.

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Bracket Push

Make sure the brackets and braces all match.

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Flatten Array

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

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Word Count

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

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Pangram

Determine if a sentence is a pangram.

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Matrix

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

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Beer Song

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

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Isogram

Determine if a word or phrase is an isogram.

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Perfect Numbers

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

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ETL

We are going to do the `Transform` step of an Extract-Transform-Load.

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Nucleotide Count

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

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exception handling

Food Chain

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

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Sum Of Multiples

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

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RNA Transcription

Given a DNA strand, return its RNA Complement Transcription.

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Phone Number

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

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Bank Account

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

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Protein Translation

Translate RNA sequences into proteins.

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exception handling

Grade School

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

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Nth Prime

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

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exception handling

Diamond

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

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Run Length Encoding

Implement run-length encoding and decoding.

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Sublist

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

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Robot Name

Manage robot factory settings.

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Robot Simulator

Write a robot simulator.

exception handling

Pythagorean Triplet

There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product a * b * c.

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Leap

Given a year, report if it is a leap year.

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Space Age

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

Pascal's Triangle

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

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Sieve

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

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Grains

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

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Kindergarten Garden

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

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Custom Set

Create a custom set type.

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Gigasecond

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

Word Search

Create a program to solve a word search puzzle.

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Luhn

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

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Triangle

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

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exception handling

Clock

Implement a clock that handles times without dates.

Series

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

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Linked List

Implement a doubly linked list

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OCR Numbers

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

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Pig Latin

Implement a program that translates from English to Pig Latin

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Minesweeper

Add the numbers to a minesweeper board

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exception handling

Crypto Square

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

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List Ops

Implement basic list operations

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Meetup

Calculate the date of meetups.

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Atbash Cipher

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

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Scrabble Score

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

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Largest Series Product

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

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exception handling

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

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Roman Numerals

Write a function to convert from normal numbers to Roman Numerals.

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Transpose

Take input text and output it transposed.

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Tournament

Tally the results of a small football competition.

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Circular Buffer

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

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Binary Search Tree

Insert and search for numbers in a binary tree.

exception handling

Bowling

Score a bowling game

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Binary

Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles

bitwise operations

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Alphametics

Write a function to solve alphametics puzzles.

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Prime Factors

Compute the prime factors of a given natural number.

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Acronym

Convert a long phrase to its acronym

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All Your Base

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

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Rectangles

Count the rectangles in an ASCII diagram.

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Allergies

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

bitwise operations

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Say

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

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POV

Reparent a graph on a selected node

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exception handling

Change

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

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Secret Handshake

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

bitwise operations

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React

Implement a basic reactive system.

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Collatz Conjecture

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

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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.

ISBN Verifier

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

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Reverse String

Reverse a string