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Exercism

Ballerina

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Overview

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Get fluent in Ballerina by solving 60 exercises. And then level up with mentoring from our world-class team.

Syllabus

  • Hello World
    • Exercism's classic introductory exercise. Just say "Hello, World!".
  • Calculator Service
    • HTTP endpoints are better with type checking. Adding a Record type to a POST request will ensure the correct data is sent every time.
  • Echo Service
    • Creating a service in ballerina is easy. Now you can add a query parameter and a relative path.
  • Service Error Handling
    • Implement various kinds of error handling and resource management.
  • Greeting Service
    • Make an HTTP service to say "Hello".
  • Hello World Service
    • The classical introductory exercise. Just create an HTTP service to say "Hello, World!".
  • Service Composition
    • In this exercise, you will use Ballerina Records to organize the request payloads and ensure successful communication with external reservation endpoints.
  • Service Invocation
    • Calling APIs is an important part of writing code on the internet.
  • CSV Fuel Allowance
    • As a member of the digital operations team, your task is to read this CSV file and write the results to another CSV file.
  • JSON Fuel Allowance
    • As a member of the digital operations team, your task is to read this JSON file and write the results to another JSON file.
  • XML Fuel Allowance
    • As a member of the digital operations team, your task is to read this XML file and write the results to another XML file.
  • Monitor Rush
    • Every employee wants to work in the new office because each cubicle has state-of-the-art monitors. The HR department is overwhelmed with such requests and came up with a cubicle allocation system with the help of its digital operations team.
  • The Cake is a Lie
    • A popular bakery that bakes various cakes, has asked you to set up an online order management system for them.
  • PaySwitch - Salary Converter
    • A company needs to convert salaries in foreign currencies to the corresponding local currency using an external API.
  • Armstrong Numbers
    • Determine if a number is an Armstrong number.
  • Game Of Life
    • Implement Conway's Game of Life.
  • Isogram
    • Determine if a word or phrase is an isogram.
  • Raindrops
    • Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.
  • Roman Numerals
    • Convert modern Arabic numbers into Roman numerals.
  • Space Age
    • Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.
  • Acronym
    • Convert a long phrase to its acronym.
  • Sieve
    • Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
  • 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.
  • Grains
    • Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.
  • 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.
  • Hamming
    • Calculate the Hamming distance between two DNA strands.
  • Difference Of Squares
    • Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
  • Leap
    • Determine whether a given year is a leap year.
  • Darts
    • Calculate the points scored in a single toss of a Darts game.
  • Two Fer
    • Create a sentence of the form "One for X, one for me.".
  • Pangram
    • Determine if a sentence is a pangram.
  • 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.
  • Protein Translation
    • Translate RNA sequences into proteins.
  • ETL
    • Change the data format for scoring a game to more easily add other languages.
  • Pascal's Triangle
    • Compute Pascal's triangle up to a given number of rows.
  • Two Bucket
    • Given two buckets of different size, demonstrate how to measure an exact number of liters.
  • Binary Search
    • Implement a binary search algorithm.
  • Linked List
    • Implement a doubly linked list.
  • 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.
  • Robot Simulator
    • Write a robot simulator.
  • Saddle Points
    • Detect saddle points in a matrix.
  • Sum Of Multiples
    • Given a number, find the sum of all the multiples of particular numbers up to but not including that number.
  • Secret Handshake
    • Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
  • Kindergarten Garden
    • Given a diagram, determine which plants each child in the kindergarten class is responsible for.
  • Yacht
    • Score a single throw of dice in the game Yacht.
  • Reverse String
    • Reverse a given string.
  • Allergies
    • Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
  • RNA Transcription
    • Given a DNA strand, return its RNA complement.
  • Triangle
    • Determine if a triangle is equilateral, isosceles, or scalene.
  • Scrabble Score
    • Given a word, compute the Scrabble score for that word.
  • 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.
  • 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.
  • Circular Buffer
    • A data structure that uses a single, fixed-size buffer as if it were connected end-to-end.
  • List Ops
    • Implement basic list operations.
  • D&D Character
    • Randomly generate Dungeons & Dragons characters.
  • Rotational Cipher
    • Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.

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