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Exercism

Kotlin

via Exercism

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Overview

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Kotlin was designed and developed by JetBrains, the company behind IntelliJ. It is a language that runs on the JVM which can target versions 6+ (including the Android platform). JetBrains wanted to use a statically typed language which can remove Java boilerplate code, provide modern functional paradigms, and had seamless two-way Java interoperability with their existing codebase. The JVM already had alternate languages like Groovy and Scala but neither fit the bill with their desired criteria, so they built Kotlin.

Syllabus

  • Hello World
    • Exercism's classic introductory exercise. Just say "Hello, World!".
  • Reverse String
    • Reverse a given string.
  • Bob
    • 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.
  • 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.
  • ETL
    • 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.
  • Isogram
    • Determine if a word or phrase is an isogram.
  • Leap
    • Determine whether a given year is a leap year.
  • Nucleotide Count
    • Given a DNA string, compute how many times each nucleotide occurs in the string.
  • Protein Translation
    • Translate RNA sequences into proteins.
  • RNA Transcription
    • Given a DNA strand, return its RNA complement.
  • 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.
  • 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.
  • Armstrong Numbers
    • Determine if a number is an Armstrong number.
  • Binary Search
    • Implement a binary search algorithm.
  • Clock
    • Implement a clock that handles times without dates.
  • Crypto Square
    • Implement the classic method for composing secret messages called a square code.
  • Difference of Squares
    • Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
  • D&D Character
    • Randomly generate Dungeons & Dragons characters.
  • Flatten Array
    • Take a nested list and return a single list with all values except nil/null.
  • Gigasecond
    • Given a moment, determine the moment that would be after a gigasecond has passed.
  • Hamming
    • Calculate the Hamming distance between two DNA strands.
  • Pangram
    • Determine if a sentence is a pangram.
  • 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.
  • Prime Factors
    • Compute the prime factors of a given natural number.
  • 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.
  • 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.
  • Rotational Cipher
    • Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
  • Run-Length Encoding
    • Implement run-length encoding and decoding.
  • 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.
  • 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.
  • 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.
  • Diamond
    • Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
  • Grade School
    • Given students' names along with the grade that they are in, create a roster for the school.
  • 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.
  • Largest Series Product
    • Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.
  • Luhn
    • Given a number determine whether or not it is valid per the Luhn formula.
  • 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.
  • Robot Simulator
    • Write a robot simulator.
  • Roman Numerals
    • Convert modern Arabic numbers into Roman numerals.
  • Saddle Points
    • Detect saddle points in a matrix.
  • Sieve
    • Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
  • Binary Search Tree
    • Insert and search for numbers in a binary tree.
  • Circular Buffer
    • A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.
  • Custom Set
    • Create a custom set type.
  • 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.
  • Matching Brackets
    • Make sure the brackets and braces all match.
  • Meetup
    • Calculate the date of meetups.
  • Pascal's Triangle
    • Compute Pascal's triangle up to a given number of rows.
  • Pig Latin
    • Implement a program that translates from English to Pig Latin.
  • Robot Name
    • Manage robot factory settings.
  • Spiral Matrix
    • Given the size, return a square matrix of numbers in spiral order.
  • Transpose
    • Take input text and output it transposed.
  • Bank Account
    • Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!
  • Bottle Song
    • Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.
  • Bowling
    • Score a bowling game.
  • Flower Field
    • Mark all the flowers in a garden.
  • Linked List
    • Implement a doubly linked list.
  • Rail Fence Cipher
    • Implement encoding and decoding for the rail fence cipher.
  • Say
    • 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.
  • Dominoes
    • Make a chain of dominoes.
  • Change
    • Correctly determine change to be given using the least number of coins.
  • Complex Numbers
    • Implement complex numbers.
  • Diffie-Hellman
    • Diffie-Hellman key exchange.
  • Forth
    • Implement an evaluator for a very simple subset of Forth.
  • List Ops
    • Implement basic list operations.
  • Simple Cipher
    • Implement a simple shift cipher like Caesar and a more secure substitution cipher.
  • Zebra Puzzle
    • Solve the zebra puzzle.
  • React
    • Implement a basic reactive system.

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