Ruby Language Modules A simple mixin with include
Example
module SomeMixin
def foo
puts "foo!"
end
end
class Bar
include SomeMixin
def baz
puts "baz!"
end
end
b = Bar.new
b.baz # => "baz!"
b.foo # => "foo!"
# works thanks to the mixin
Now Bar is a mix of its own methods and the methods from SomeMixin.
Note that how a mixin is used in a class depends on how it is added:
- the
includekeyword evaluates the module code in the class context (eg. method definitions will be methods on instances of the class), extendwill evaluate the module code in the context of the singleton class of the object (methods are available directly on the extended object).
