Ruby mixin: extend or include?

Question

I have following code:

module CarHelper
  def call_helpline
    puts "Calling helpline..."
  end
end

class Car
  extend CarHelper
end

class Truck
  class << self
    include CarHelper
  end
end

# Test code
Car.call_helpline
Truck.call_helpline

In fact both 2 lines of test codes works. So is there any difference between the way I use 'extend' and 'include' (inside a singleton class of self)?

See the interesting discussion about [What is the difference between include and extend in Ruby?](http://stackoverflow.com/questions/156362/what-is-the-difference-between-include-and-extend-in-ruby) — mliebelt, Sep 30 '11 at 06:13

score 2 · Accepted Answer · answered Dec 22 '11 at 14:39

2

No , It's the same thing but the first way is cleaner .

answered Dec 22 '11 at 14:39

lesce

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Ruby mixin: extend or include?

1 Answers1