OO Person Lab

Learning Goals

• Gain proficiency instantiating a class
• Gain ability to discern when to implement attr_accessor, attr_reader, and attr_writer
• Gain ability to discern when to define your own attr_reader (getter) and attr_writer (setter) methods

Introduction

To practice object oriented programming (OOP), you're going to create a Person class. Each instance of the Person class will have the ability to:

• Get paid/receive payments
• Take a bath
• Call a friend
• Start a conversation
• State if they are happy and/or clean

A Note on Notation

In the instructions below (and in other labs), you'll see this notation used to represent instance methods and class methods:

• ClassName#method_name: represents an instance method that can be called on the class
• ClassName.method_name: represents a class method that can be called on the class

For example, Person#name is an example of an instance method, that we can call on an instance of a class:

class Person
  def name
    @name
  end
end

We can also define this particular instance method using a macro (which creates the getter method for us):

class Person
  attr_reader :name

end

Person.new is an example of a class method (remember, to create a new instance of the class, we call ClassName.new, which then calls the instance method ClassName#initialize).

Instructions

Create a Person class with the behavior described below. You can use attr_ macros for some of these deliverables; for others, you'll need to write custom getter and/or setter methods.

• Person.new(name): takes an argument of a name and saves it to the object. The person's name should not be able to change after initialization. When a new person is created, they should have the following attributes in addition to their name (saved to instance variables):

  • @bank_account with an initial value of 25
  • @happiness with an initial value of 8
  • @hygiene with an initial value of 8

• Person#name: gets the person's name.

• Person#bank_account: gets the amount in a person's bank account.

• Person#bank_account=(value): sets the value of the bank account to a new amount.

• Person#happiness: gets the value of the person's happiness points.

• Person#happiness=(value): sets the value of the person's happiness points. The maximum value allowed is 10, and the minimum value allowed is 0.

• Person#hygiene: gets the value of the person's hygiene points.

• Person#hygiene=(value): sets the value of the person's hygiene points. The maximum value allowed is 10, and the minimum value allowed is 0.

Additional Instance Methods

• Person#clean?: returns true if the person's hygiene is more than seven; otherwise, it returns false.

• Person#happy?: returns true if the person's happiness is more than seven; otherwise, it returns false.

• Person#get_paid(amount): accepts a salary amount and adds this to the person's bank account. The method should return the string "all about the benjamins".

• Person#take_bath: increments the person's hygiene points by four and returns the string "♪ Rub-a-dub just relaxing in the tub ♫".

• Person#work_out: increments the person's happiness by two points, decreases their hygiene by three points, and returns the Queen lyrics, "♪ another one bites the dust ♫".

• Person#call_friend(friend): accepts another instance of the Person class, or "friend". The method should increment the person and the friend's happiness points by three. It should also return a string. For example, if Stella calls her friend Felix, the method increment both Stella and Felix's happiness points and then return "Hi Felix! It's Stella. How are you?".

• Person#start_conversation(friend, topic): accept two arguments, the friend to start a conversation with and the topic of conversation.

  • If the topic is politics, both people get sadder (their happiness decreases by 2) and the method returns "blah blah partisan blah lobbyist".
  • If the topic is weather, both people get a little happier (their happiness increases by 1) and the method returns "blah blah sun blah rain".
  • If the topic is not politics or weather, their happiness points don't change and the method returns "blah blah blah blah blah".