Class Methods vs Module Methods?

[PHP HD]

Hello all,

Is there anybody else confused about module methods? Why would you
create one when you could create a class method that is essentially the
same thing but with more functionality?

 

[Daniel Kempkens]

Hello all,

Is there anybody else confused about module methods? Why would you
create one when you could create a class method that is essentially the
same thing but with more functionality?

Because you can "mixin" these methods in classes.
module Foo
def test
puts "Hello!"
end
end

class Bar
include Foo
end

f = Bar.new
f.test #=> Hello!

 

[Phrogz]

Is there anybody else confused about module methods? Why would you
create one when you could create a class method that is essentially the
same thing but with more functionality?

Because sometimes you want a namespace for methods, but there's no
class that can be instantiated:

module Cupid
def self.createConnection( person1, person2 )
# ...mysterious details here...
end
end

Cupid.createConnection( ... )


These may also be utility methods used by 'instance' methods in a
module that will be mixed into one or more other classes.