Defining class methods with Modularity traits

There are two ways to define a class method from a Modularity Show archive.org snapshot trait. Note that the usual caveats regarding class method visibility apply.

Using def

You can def the method on self:

module SomeTrait
  as_trait do
    def self.foo
      # ...
    end
  end
end

However, you cannot use it with traits parameters.

Using define_singleton_method

If you need to use trait parameters (|name| in the example below), you cannot use self.def. Use define_singleton_method instead:

module SomeTrait
  as_trait do |name|
    define_singleton_method :foo do
      puts name
    end
  end
end