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Exercism

Pharo

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Overview

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Welcome to Pharo, an environment and language that embraces creativity, exploration and fun. It features a world that is: Simple and Powerful: No constructors, type declarations, interfaces or primitive types. Yet it's a powerful and elegant language with a full syntax that fits on a ! The magic is objects and messages all the way down.

Syllabus

  • Hello World
    • Exercism's classic introductory exercise. Just say "Hello, World!".
  • Die
    • A small DSL for dice rolling
  • Gigasecond
    • Given a moment, determine the moment that would be after a gigasecond has passed.
  • Leap
    • Determine whether a given year is a leap year.
  • Resistor Color Duo
    • Convert color codes, as used on resistors, to a numeric value.
  • Reverse String
    • Reverse a given string.
  • Space Age
    • Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.
  • Two-Fer
    • Create a sentence of the form "One for X, one for me.".
  • Acronym
    • Convert a long phrase to its acronym.
  • Armstrong Numbers
    • Determine if a number is an Armstrong number.
  • Clock
    • Implement a clock that handles times without dates.
  • Collatz Conjecture
    • Calculate the number of steps to reach 1 using the Collatz conjecture.
  • Darts
    • Write a function that returns the earned points in a single toss of a Darts game.
  • ETL
    • Change the data format for scoring a game to more easily add other languages.
  • Flatten Array
    • Take a nested list and return a single list with all values except nil/null.
  • Grains
    • Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
  • Hamming
    • Calculate the Hamming difference between two DNA strands.
  • High Scores
    • Manage a player's High Score list.
  • Isogram
    • Determine if a word or phrase is an isogram.
  • Pangram
    • Determine if a sentence is a pangram.
  • Raindrops
    • Convert a number to a string, the content of which depends on the number's factors.
  • Secret Handshake
    • Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
  • Twelve Days
    • Output the lyrics to 'The Twelve Days of Christmas'.
  • 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.
  • Atbash Cipher
    • Create an implementation of the atbash cipher, an ancient encryption system created in the Middle East.
  • Binary
    • Convert a binary number, represented as a string (e.g. '101010'), to its decimal equivalent using first principles.
  • Diamond
    • Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
  • ISBN Verifier
    • Check if a given string is a valid ISBN-10 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.
  • Roman Numerals
    • Convert modern Arabic numbers into Roman numerals.
  • Sieve
    • Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
  • Sum of Multiples
    • Given a number, find the sum of all the multiples of particular numbers up to but not including that number.
  • Word Count
    • Given a phrase, count the occurrences of each word in that phrase.
  • All Your Base
    • Convert a number, represented as a sequence of digits in one base, to any other base.
  • Grade School
    • Given students' names along with the grade that they are in, create a roster for the school.
  • 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.
  • Matrix
    • Given a string representing a matrix of numbers, return the rows and columns of that matrix.
  • Robot Simulator
    • Write a robot simulator.
  • Simple Cipher
    • Implement a simple shift cipher like Caesar and a more secure substitution cipher.
  • Bowling
    • Score a bowling game.
  • Circular Buffer
    • A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.
  • Minesweeper
    • Add the numbers to a minesweeper board.
  • Tournament
    • Tally the results of a small football competition.
  • Binary Search Tree
    • Insert and search for numbers in a binary tree.
  • Forth
    • Implement an evaluator for a very simple subset of Forth.
  • OCR Numbers
    • Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
  • Word Search
    • Create a program to solve a word search puzzle.
  • Rectangles
    • Count the rectangles in an ASCII diagram.

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