TECH603 Day 5 example code - Working with Classes, Containers, and Cups

cup.rb

# shared `label_name` functionality
module Label
  def label_name
    "[#{self.class.to_s.upcase}] - Has a Label Name"
  end
end

# Car - includes `Label`
class Car
  include Label
  
  attr_reader :name
  
  def initialize
    @name = "A Car"
  end
end

# Container - our base for working with things to drink from - includes `Label`
class Container
  include Label
  
  attr_accessor :color, 
                :contents,
                :handle,
                :lid
  
  def initialize(contents = :empty)
    @color = ""
    @contents = contents
    @handle = false
    @lid = false
  end

  def contents?
    contents != :empty
  end
  
  def empty!
    self.contents = :empty
  end
  alias_method :empty_contents, :empty!

  def handle?
    !!handle
  end
  
  def lid?
    !!lid
  end
  
  def to_s
    "[#{self.class.to_s.upcase}] contents: #{contents}, color: #{color}, handle: #{handle?}, lid: #{lid?}"
  end
end

# Cup - inherits from Container
class Cup < Container
  # default to blue
  def initialize(contents = :empty)
    super
    @color = "blue"
  end
end

# Mug - inherits from Container
class Mug < Container
  # default white
  # has a handle
  def initialize(contents = :empty)
    super
    @color = "white"
    @handle = true
  end
end

# TravelMug - inherits from Container
class TravelMug < Container
  # default to black
  # no handle
  # has a lid
  def initialize(contents = :empty)
    super
    @color = "black"
    @lid = true
  end
end

car = Car.new
puts car
puts car.label_name

container = Container.new
puts container
puts container.label_name
# puts container.inspect
# puts container.class.ancestors.to_s
# puts container.methods.to_s


cup = Cup.new("juice")
cup.lid = "foo"
puts cup
# puts cup.inspect
# puts cup.class.ancestors.to_s
puts cup.label_name


# [CUP] contents: juice, color: blue, handle: false, lid: false                      
# #<Cup:0x007f13f7fc6d60 @color="blue", @contents="juice", @handle=false, @lid=false>        

mug = Mug.new("coffee")
puts mug
puts mug.inspect
puts mug.class
# [MUG] contents: coffee, color: white, handle: true, lid: false                
# #<Mug:0x007f13f7fc6ab8 @color="white", @contents="coffee", @handle=true, @lid=false>       

tmug = TravelMug.new("tea")
puts tmug
puts tmug.inspect
puts tmug.class
# [TRAVELMUG] contents: tea, color: black, handle: false, lid: true              
# #<TravelMug:0x007f13f7fc6888 @color="black", @contents="tea", @handle=false, @lid=true>  


containers = [cup, mug, tmug]
containers.each do |container|
  puts "Container [#{container.class}] has handle? #{container.handle?}"
end

cup_example.rb

class Cup
  attr_accessor :color, 
                :contents, 
                :lid
  
  def initialize(contents = :empty)
    @color = "blue"
    @contents = contents
    @lid = false
  end

  def me
    self
  end
    
  def contents?
    contents != :empty
  end
  
  def empty!
    self.contents = :empty
  end
  alias_method :empty_contents, :empty!
  
  def fill_with(contents)
    self.contents = contents
  end
  
  def lid?
    lid
  end
  
  def to_s
    "[CUP] contents: #{contents}, color: #{color}, lid: #{lid}"
  end
end

cup = Cup.new("juice")
puts cup
puts cup.inspect
puts cup.contents?
puts cup.empty!
puts cup.empty_contents
cup.fill_with "water"
puts cup.color
puts cup
puts cup.me
puts cup.object_id == cup.me.object_id