JS-Intro-OOP-Exercises

Exercises

Objectives:

• Get comfortable creating a class with properties and methods
• Practice creating objects and methods that interact with one another
• Instance several objects that are contained within a special container object
• Encapsulate functionality within the proper class

Exercises:

The Cat

Write yourself a virtual cat - animals with a CLI are so much nicer than ones with fur.

• Create an object that represents a cat. It should have properties for tiredness, hunger, lonliness and happiness
• Next, write methods that increase and decrease those properties. Call them something that actually represents what would increase or decrease these things, like "feed", "sleep", or "pet".
• Last, write a method that prints out the cat's status in each area. (Be creative e.g. Paws is really hungry, Paws is VERY happy.)
• Bonus: Make the functions take arguments that increase or decrease arbitrary amounts
• Bonus: Make the functions as arbitrary as cats are - sometimes make it so the cat doesn't want to be petted.

The Reading List

An object-oriented book-list!

• Create a class BookList

• Create another class called Book

• BookLists should have the following properties:

  • Number of books marked as read
  • Number of books marked not read yet
  • A reference to the next book to read (book object)
  • A reference to the current book being read (book object)
  • A reference to the last book read (book object)
  • An array of all the Books

• Each Book should have several properties:

  • Title
  • Genre
  • Author
  • Read (true or false)
  • Read date, can be blank, otherwise needs to be a JS Date() object

• Every Booklist should have a few methods:

  • .add(book)
    • should add a book to the books list.
  • .finishCurrentBook()
    • should mark the book that is currently being read as "read"
    • Give it a read date of new Date(Date.now())
    • Change the last book read to be the book that just got finished
    • Change the current book to be the next book to be read
    • Change the next book to be read property to be the first unread book you find in the list of books

• Booklists and Books might need more methods than that. Try to think of more that might be useful.

The Game (advanced)

Pick one of three games: Chess, Poker, or Roshambo (rock, paper, scissors). Roshambo is the easiest, followed by Poker, then Chess.

• Your game should have a Game object shat should be responsible for keeping track of it's state
  • State depends on the game, all games have players, but not all games have pieces, cards, or moves. try to plan out what your state will be first
  • Your game should keep a reference to players, and it should tell them whether or not they have won or lost
  • Your game should be able to look at the state of the players and execute a turn- this is where you put code that looks at the state of each player and evaluates the results of what happens when that player changes it's state
  • Some games will have multiple turns that will change the state of the game, while others (like roshambo) only have one turn that determines a win or a loss.
• You should have Players for your game, which should be a class
  • Each player should keep track of how many wins and losses it has
  • Players should keep track of their pieces, cards, or hands
• You should have a class for each Piece, Card or Move

It's up to you to do the rest of the design for this program! Ensure two players can be created in the console as classes, join a game, execute methods with moves, and one player can win each game.