Mixins

• mix-in-s
• A mixin can basically be thought of as a set of code that can be added to one or more classes to add additional capabilities without using inheritance
• Good article: https://www.sitepoint.com/ruby-mixins-2/

Including multiple modules:

module Fly

def fly_far

puts "I can fly far."

end

end

module Eat

def eat_tacos

puts "I eat tacos."

end

end

class Bird

include Fly

include Eat

end

bird = Bird.new

bird.fly_far

bird.eat_tacos

# Output

$ruby main.rb

I can fly far.

I eat tacos.

Can't include classes:

class Fly

def fly_far

puts "I can fly far."

end

end

class Eat

def eat_tacos

puts "I eat tacos."

end

end

class Bird

include Fly

include Eat

end

bird = Bird.new

bird.fly_far

bird.eat_tacos

# Output:

$ruby main.rb

main.rb:14:in `include': wrong argument type Class (expected Module) (TypeError)

from main.rb:14:in `<class:Bird>'

from main.rb:13:in `<main>'

Check:

• include vs extend