Ruby MVC example @lewagon

animal.rb

# Assign costants at the top of the file.
# Use capital letters for the name, and the #freeze method on the object
PHYLA = %w[Ecdysozoa Lophotrochozoa Radiata Deuterostomia].freeze

class Animal
  attr_reader :name

  def initialize(name)
    @name = name
  end

  def self.phyla
    PHYLA
  end

  def eat(food)
    "#{@name} eats a #{food}"
  end
end

interface.rb

# We use one interface for different data types.
# This is called *polimorphism*, see https://stackoverflow.com/questions/1031273/what-is-polymorphism-what-is-it-for-and-how-is-it-used

require_relative "lion"
require_relative "meerkat"
require_relative "warthog"

animals = []

simba = Lion.new("Simba")
animals << simba

timon = Meerkat.new("Timon")
animals << timon

pumbaa = Warthog.new("Pumbaa")
animals << pumbaa

puts "The sounds of these animals:"
animals.each do |animal|
  puts animal.talk
end

puts "\nThe 4 phyla:"
# All animals classes inherit from Animal, so #phyla can be called on any of them!
puts Meerkat.phyla

puts "\nWhat do they eat?"
puts simba.eat("meat")
puts timon.eat("scorpion")
puts pumbaa.eat("pizza")

lion.rb

require_relative "animal"

class Lion < Animal
  def eat(food)
    "#{super}. Law of the jungle!"
  end
end

meerkat.rb

require_relative "animal"

class Meerkat < Animal
  def talk
    "#{@name} bark!"
  end
end

warthog.rb

require_relative "animal"

class Warthog < Animal
  def talk
    "#{@name} grunt!"
  end
end