Object Oriented Programming Workshop

ooo.rb

def sum(a, b)
  return a + b
end

class Sum
  attr_writer :a
  def initialize(a, b)
    @a = a
    @b = b
  end

  def perform
    return @a + @b
  end
end





class Animal
  attr_accessor :has_backbone,
                :cold_blooded

  DEFAULT_NUM_LEGS = 4.freeze

  def number_of_legs
    DEFAULT_NUM_LEGS
  end
end

class Mammal < Animal
  def has_backbone
    true
  end
end

dog = Mammal.new
dog.has_backbone = true
dog.cold_blooded = false

class Human < Mammal
  attr_reader :skin_colour

  def initialize(skin_colour: nil)
    @skin_colour = skin_colour
  end

  def cold_blooded
    "what are you crazy"
  end
end

human = Human.new
human.has_backbone = false
human.cold_blooded = true


module FishMethods
  def has_gills?
    true
  end
end

class Fish < Animal
  include FishMethods

  def number_of_legs
    0
  end
end

fish = Fish.new
fish.has_backbone = true
fish.cold_blooded = true

class Aquaman < Human
  include FishMethods
end

aquaman = Aquaman.new


animal = Animal.new


def method_1(other_method)
  p "starting method 1"
  other_method.call
  p "ending method 1"
  nil
end

def method_2
  p "W00 i made it to method 2"
  nil
end

method_1(-> { method_2 })