cat.rb

require_relative './pet'

class Cat < Pet

  def speak
    puts "Meow!"
  end
end

kitty = Cat.new("beige", "Persian")
puts "Let's inspect our new cat:"
puts kitty.inspect
puts kitty.class
puts "Is our new cat an object?"
puts kitty.is_a?(Object)

puts "What color is our cat?"
puts kitty.color
puts "Let's give our new cat a name"
kitty.name = "Betsy"
puts kitty.name

puts "Is our cat hungry now?"
kitty.hungry?
puts "Let's feed our cat"
kitty.feed("tuna")
puts "Is our cat hungry now?"
kitty.hungry?
puts "Our cat can make noise"
kitty.speak

dog.rb

require_relative "./pet"

class Dog < Pet
  def speak
    puts "Woof!"
  end
end

puppy = Dog.new("black", "Staffordshire Terrier")
puppy.speak
puts puppy.breed

gistfile1.txt

 A brief explanation of the keyword self in instance methods  - instance methods work with an instance of a class
A brief definition of class methods - Methods that work with the class,but doesn't work with instances of that class
A brief explanation of inheritance: relationship between a parent class and a child class where the child class inherits everything from the parent.

pet.rb

class Pet
  attr_reader :color, :breed
  attr_accessor :name

  def initialize(color, breed)
    @color = color
    @breed = breed
    @hungry = true
  end

  def feed(food)
    puts "Mmm, " + food + "!"
    @hungry = false
  end

  def hungry?
    if @hungry
      puts "I\'m hungry!"
    else
      puts "I\'m full!"
    end
    @hungry
  end
end