TECH603 Day 4 - Working with Cups

cup.rb

# define a class
class Cup
  # class definition
  def initialize
    puts "I am initializing ... I should be a new cup"
    @contents = "coffee"
  end
  
  def contents
    @contents
  end
  
  def lid?
    true
  end
  
  def empty
    @contents = nil
    puts "The cup should be empty"
  end
end

# instance 1
cup = Cup.new
puts cup
# puts cup.object_id
puts cup.contents.inspect
puts cup.lid?
puts cup.empty
puts cup.contents.inspect

#instance 2
puts "====="
cup2 = Cup.new
puts cup2
# puts cup2.object_id
puts cup2.contents.inspect
puts cup2.lid?
puts cup2.empty
puts cup2.contents.inspect

# puts "".class
# puts Hash.new.class
# puts [].class
# puts 5.class
# puts 5.4.class
# puts :hi.class
# puts Cup.new.class
# puts Cup.class

cup_example.rb

class Cup
  def initialize(contents = "")
    # instance variables - `ivar`s
    @contents = contents
    @color = "blue"
    @lid = false
  end
  
  attr_reader :color
  attr_writer :color
  
  attr_accessor :lid
  
  def contents
    @contents
  end

  def contents=(contents)
    @contents = contents
  end

  def to_s
    "[CUP] contents: #{contents} - color: #{color} - lid: #{lid}"
  end
end

cup = Cup.new("wine")
puts cup

puts cup.contents
cup.contents = "juice"
puts cup.contents

puts cup.color
cup.color = "red"
puts cup.color

puts cup.lid
cup.lid = true
puts cup.lid

cups.rb

# define a class
class Cup
  # class definition
  def initialize(contents = "")
    @contents = contents
    @lid = false
    @color = "green"
  end

  attr_accessor :contents
  attr_accessor :lid
  
  attr_reader :color
  attr_writer :color

  def lid?
    @lid
  end

  def fill(drink)
    self.contents = drink
  end
  
  def empty
    self.contents = ""
  end
end

# instance 1
cup = Cup.new("juice")
# cup.fill("juice")
puts "contents: #{cup.contents.inspect}"
puts "color: #{cup.color}"
puts "lid? #{cup.lid?}"
cup.lid = true
puts "lid? #{cup.lid}"
cup.color  = "blue"
puts "color: #{cup.color}"
cup.contents = "something"
puts "contents: #{cup.contents.inspect}"
cup.empty
puts "contents: #{cup.contents.inspect}"

puts "=====" * 3

# instance 2

cup2 = Cup.new

cup2.fill("coffee")

puts "contents: #{cup2.contents.inspect}"