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Extend and Include in Ruby

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I have been trying to clean up some old code with Ruby modules. This post is to help me remember the differences between include and extend in Ruby.

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class Foo
  extend ActionView::Helpers::NumberHelper
end

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module Foo
  extend ActionView::Helpers::NumberHelper
end

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Foo.number_to_currency 2
 => "$2.00"

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class Foo
  include ActionView::Helpers::NumberHelper
end

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foo = Foo.new
foo.number_to_currency 2
 => "$2.00"

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