From: Florian Gross <florgro@...>
Date: 2007-01-03T01:20:51+09:00
Subject: Re: Detecting default used in method calls

Peter Lynch wrote:

> I would like to know if a function has been called with or without an
> optional argument.

Not very pretty:

def fun(a, b = (no_b = true; 5))
   if no_b then
     "Fun(%p): %p" % [a, b]
   else
     "Fun(%p, %p)" % [a, b]
   end
end

fun(1) # => "Fun(1): 5"
fun(1, 2) # => "Fun(1, 2)"