From: "Peña, Botp" <botp@...>
Date: 2008-11-17T17:05:15+09:00
Subject: Re: How can I overload a method in Ruby

From: Zhao Yi [mailto:youhaodeyi@gmail.com] 
# def build()
#     make
# end
# 
# def build(directory)
#     cd directory
#     make
# end
# 
# but without overloading, I have to do this:
# def build(directory)
#     if(directory == nil)
#       make
#     else
#       cd directory
#       make
#     endif
# end

try it like,

def build directory=nil
  cd directory unless directory.nil?
  make
end