Mixins
Mixins
Warmup
- What do you know about modules already? If little, what would you guess modules are all about?
- Football and soccer both use a ball, but each has its own attributes. What behaviors might they share?
Introduction
- Mixins allow us to share behavior between classes
- Ruby implements mixins with Modules
- Modules only store behavior
- Modules do not store state
GrubHubOrder
class GrubhubOrder
def confirmation(thing)
puts "You got #{thing}."
end
def review
puts "Please rate your order within 30 days."
end
def delivery
puts "Your food will arrive in 45-60 minutes."
end
end
AmazonOrder
class AmazonOrder
def confirmation(thing)
puts "You got #{thing}."
end
def review
puts "Please rate your order within 30 days."
end
def delivery
puts "Your order will arrive in 2 business days."
end
end
OnlineRunner
require "./amazon_order.rb"
require "./grubhub_order.rb"
amazon = AmazonOrder.new
grub = GrubHubOrder.new
amazon.delivery
grub.delivery
amazon.review
grub.review
Discuss
How might we use a mixin to make this code better?
OnlineOrder
module OnlineOrder
def confirmation(thing)
puts "You got #{thing}."
end
def review
puts "Please rate your order within 30 days."
end
end
GrubHubOrder
require "./online_order"
class Grubhub
include OnlineOrder
def delivery
puts "Your food will arrive in 45-60 minutes."
end
end
AmazonOrder
require "./online_order"
class Amazon
include OnlineOrder
def delivery
puts "Your order will arrive in 2 business days."
end
end
Discuss
What will happen when I run my runner file now?
Exercise & Further Practice
See lesson plan.
