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Exercism

Ruby

via Exercism

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Overview

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  • Join Exercism’s Ruby Track for access to 109 exercises grouped into 16 Ruby Concepts, with automatic analysis of your code andpersonal mentoring, all 100% free.
  • Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write.
  • Ruby was created as a language of careful balance. Its creator, Yukihiro “Matz” Matsumoto, blended parts of his favorite languages (Perl, Smalltalk, Eiffel, Ada, and Lisp) to form a new language that balanced functional programming with imperative programming.
  • He has often said that he is "trying to make Ruby natural, not simple," in a way that mirrors life.
  • Building on this, he adds: "Ruby is simple in appearance, but is very complex inside, just like our human body."
  • You can read more about the Ruby language on its site.

Syllabus

  • Hello World
    • Exercism's classic introductory exercise. Just say "Hello, World!".
  • Lasagna
    • Learn about the basics of Ruby by following a lasagna recipe.
  • Amusement Park
    • Learn about nil and instance variables by designing a system to administer attendance and rides in an amusement park.
  • Amusement Park Improvements
    • Learn about booleans by writing a system that can check if an attendee can use a ride.
  • Log line Parser
    • Learn about strings by processing logs.
  • Assembly Line
    • Learn about numbers by analyzing the production of an assembly line.
  • Savings Account
    • Learn about floating point numbers by adding interest to savings accounts.
  • Port Of Palermo
    • Learn about the symbols while helping out with modernize the ports of Palermo computer system.
  • Chess Game
    • Learn about ranges while making a chess game.
  • BlackJack
    • Learn about cases while simulating blackjack
  • Bird Count
    • Learn about arrays by keeping track of how many birds visit your garden.
  • Boutique Inventory
    • Learn advanced enumeration functionality by preparing your online fashion boutique for its big annual sale.
  • Boutique Inventory Improvements
    • Learn about ostruct by refactoring your online fashion boutique's inventory management system.
  • Locomotive Engineer
    • Learn about decomposition and multiple assignment in Ruby while helping Linus with his train control system.
  • Moviegoer
    • Learn about the ternary operator by building out rules for a movie theater's website.
  • Simple Calculator
    • Learn about exceptions and error handling by building a simple calculator.
  • Two Fer
    • Create a sentence of the form "One for X, one for me.".
  • Resistor Color Duo
    • Convert color codes, as used on resistors, to a numeric value.
  • Acronym
    • Convert a long phrase to its acronym.
  • High Scores
    • Manage a player's High Score list.
  • Reverse String
    • Reverse a given string.
  • D&D Character
    • Randomly generate Dungeons & Dragons characters.
  • Matrix
    • Given a string representing a matrix of numbers, return the rows and columns of that matrix.
  • Series
    • Given a string of digits, output all the contiguous substrings of length `n` in that string.
  • Word Count
    • Given a phrase, count the occurrences of each word in that phrase.
  • 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.
  • Hamming
    • Calculate the Hamming distance between two DNA strands.
  • Raindrops
    • Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.
  • Isogram
    • Determine if a word or phrase is an isogram.
  • Scrabble Score
    • Given a word, compute the Scrabble score for that word.
  • Luhn
    • Given a number determine whether or not it is valid per the Luhn formula.
  • Clock
    • Implement a clock that handles times without dates.
  • Twelve Days
    • Output the lyrics to 'The Twelve Days of Christmas'.
  • Tournament
    • Tally the results of a small football competition.
  • Gigasecond
    • Given a moment, determine the moment that would be after a gigasecond has passed.
  • Resistor Color
    • Convert a resistor band's color to its numeric representation.
  • RNA Transcription
    • Given a DNA strand, return its RNA complement.
  • Leap
    • Determine whether a given year is a leap year.
  • Pangram
    • Determine if a sentence is a pangram.
  • Space Age
    • Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.
  • Triangle
    • Determine if a triangle is equilateral, isosceles, or scalene.
  • Difference of Squares
    • Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
  • Anagram
    • Given a word and a list of possible anagrams, select the correct sublist.
  • Spiral Matrix
    • Given the size, return a square matrix of numbers in spiral order.
  • Sum of Multiples
    • Given a number, find the sum of all the multiples of particular numbers up to but not including that number.
  • Transpose
    • Take input text and output it transposed.
  • Armstrong Numbers
    • Determine if a number is an Armstrong number.
  • Flatten Array
    • Take a nested list and return a single list with all values except nil/null.
  • Phone Number
    • Clean up user-entered phone numbers so that they can be sent SMS messages.
  • Grains
    • Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
  • Resistor Color Trio
    • Convert color codes, as used on resistors, to a human-readable label.
  • Saddle Points
    • Detect saddle points in a matrix.
  • ETL
    • Change the data format for scoring a game to more easily add other languages.
  • Nucleotide Count
    • Given a DNA string, compute how many times each nucleotide occurs in the string.
  • Pythagorean Triplet
    • Given an integer N, find all Pythagorean triplets for which a + b + c = N.
  • Collatz Conjecture
    • Calculate the number of steps to reach 1 using the Collatz conjecture.
  • Sieve
    • Use the Sieve of Eratosthenes to find all the primes from 2 up to a given 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.
  • Palindrome Products
    • Detect palindrome products in a given range.
  • Parallel Letter Frequency
    • Count the frequency of letters in texts using parallel computation.
  • Bob
    • Bob is a lackadaisical teenager. In conversation, his responses are very limited.
  • Nth Prime
    • Given a number n, determine what the nth prime is.
  • Perfect Numbers
    • Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.
  • Alphametics
    • Given an alphametics puzzle, find the correct solution.
  • Binary Search
    • Implement a binary search algorithm.
  • Two Bucket
    • Given two buckets of different size, demonstrate how to measure an exact number of liters.
  • Matching Brackets
    • Make sure the brackets and braces all match.
  • All Your Base
    • Convert a number, represented as a sequence of digits in one base, to any other base.
  • Allergies
    • Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
  • Rail Fence Cipher
    • Implement encoding and decoding for the rail fence cipher.
  • Run-Length Encoding
    • Implement run-length encoding and decoding.
  • Flower Field
    • Mark all the flowers in a garden.
  • Robot Simulator
    • Write a robot simulator.
  • Bottle Song
    • Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.
  • Protein Translation
    • Translate RNA sequences into proteins.
  • Wordy
    • Parse and evaluate simple math word problems returning the answer as an integer.
  • Secret Handshake
    • Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
  • Atbash Cipher
    • Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.
  • Crypto Square
    • Implement the classic method for composing secret messages called a square code.
  • List Ops
    • Implement basic list operations.
  • Robot Name
    • Manage robot factory settings.
  • Simple Cipher
    • Implement the Vigenère cipher, a simple substitution cipher.
  • Dominoes
    • Make a chain of dominoes.
  • Pig Latin
    • Implement a program that translates from English to Pig Latin.
  • Simple Linked List
    • Write a simple linked list implementation that uses Elements and a List.
  • Binary Search Tree
    • Insert and search for numbers in a binary tree.
  • Change
    • Correctly determine change to be given using the least number of coins.
  • Circular Buffer
    • A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.
  • Grade School
    • Given students' names along with the grade that they are in, create a roster for the school.
  • Roman Numerals
    • Convert modern Arabic numbers into Roman numerals.
  • Rotational Cipher
    • Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
  • Affine Cipher
    • Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.
  • Kindergarten Garden
    • Given a diagram, determine which plants each child in the kindergarten class is responsible for.
  • Largest Series Product
    • Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
  • Prime Factors
    • Compute the prime factors of a given natural number.
  • Custom Set
    • Create a custom set type.
  • House
    • Output the nursery rhyme 'This is the House that Jack Built'.
  • Linked List
    • Implement a doubly linked list.
  • Poker
    • Pick the best hand(s) from a list of poker hands.
  • ISBN Verifier
    • Check if a given string is a valid ISBN-10 number.
  • Complex Numbers
    • Implement complex numbers.
  • Meetup
    • Calculate the date of meetups.
  • Diamond
    • Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
  • Bowling
    • Score a bowling game.
  • OCR Numbers
    • Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
  • Say
    • Given a number from 0 to 999,999,999,999, spell out that number in English.
  • Zipper
    • Creating a zipper for a binary tree.
  • Grep
    • Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.
  • Food Chain
    • Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.
  • Pascal's Triangle
    • Compute Pascal's triangle up to a given number of rows.
  • 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.
  • Yacht
    • Score a single throw of dice in the game Yacht.
  • 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.
  • Connect
    • Compute the result for a game of Hex / Polygon.
  • Microwave
    • Convert the buttons entered on the microwave panel to their timer equivalent
  • Darts
    • Calculate the points scored in a single toss of a Darts game.
  • Bank Account
    • Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!
  • Gilded Rose
    • Refactor an inventory system and add a new feature to it.
  • 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.
  • Zebra Puzzle
    • Solve the zebra puzzle.

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