prepend
So far, we've discussed the include, extend, and module methods and namespaces. There is one more aspect to modules that came with the Ruby 2.0 release several years ago: prepend. prepend is not often used, perhaps because it is not well understood. Let's change that.
First, let's consider the following example:
module ClassLogger
def log(msg)
"[#{self.class}] #{msg}"
end
end
class User
include ClassLogger
def log(msg)
"[#{Time.now.to_f.to_s}] #{super(msg)}"
end
end
class Company
prepend ClassLogger
def log(msg)
"[#{Time.now.to_f.to_s}] #{super(msg)}"
end
end
We've created a module called ClassLogger, which implements a log method. This method wraps a string and outputs the current class. We've also created two classes, Company and User, which...