lrthw/exercises/ex42.rb

# Animal is-a object
class Animal
  def initialize(latin_name)
    # Animal has-a latin_name
    @latin_name = latin_name
  end
end

# Dog is-a Animal
class Dog < Animal
  def initialize(latin_name, name)
    super(latin_name)
    # Dog has-a name
    @name = name
  end
end

# Cat is-a Animal
class Cat < Animal
  def initialize(latin_name, name)
    super(latin_name)
    # Cat has-a name
    @name = name
  end

  attr_reader :name
end

# Person is-a object
class Person
  def initialize(name, pet = nil)
    # Person has-a name
    @name = name

    # Person has-a pet of some kind
    @pet = pet
  end

  attr_accessor :pet
end

# Employee is-a Person
class Employee < Person
  def initialize(name, salary)
    super(name)
    @salary = salary
  end
end
# class Employee < Person
#   def initialize(name, salary)
#     # Employee has-a name
#     super(name)
#     # Employee has-a salary
#     @salary = salary
#   end
# end

# Fish is-a object
class Fish
end

# Salmon is-a Fish
class Salmon < Fish
end

# Halibut is-a Fish
class Halibut < Fish
end

# rover is-a Dog
rover = Dog.new("Latin", "Rover")

# satan is-a Cat
satan = Cat.new("Latin", "Satan")

# mary is-a Person
mary = Person.new("Mary")

# mary has-a Pet, satan
mary.pet = satan

# frank is-a Employee
frank = Employee.new("Frank", 120_000)

# frank has-a pet, rover
frank.pet = rover

# flipper is-a Fish
flipper = Fish.new

# crouse is-a Salmon
crouse = Salmon.new

# harry is-a Halibut
harry = Halibut.new

# fidget is-a cat
fidget = Cat.new("Latin", "Fidget")
# james is-a Person and has-a pet, Fidget
james = Person.new("James", fidget)

puts james.pet.name # Fidget