From: Mark Bilk <mark@...>
Date: 2009-04-10T02:44:53+09:00
Subject: Calling a Function Before It's Defined

I would like to be able to call a function (or a class,
when I get more object-oriented) earlier in the program
file than where I define it.  Such a "top-down" layout
seems natural to me.  In C I could use a function
prototype for this.  If I try it in Ruby, I get an error
(see code below).

Even if I do define everything before I use it, how could
I write a recursive function, or two mutually recursive
functions?

s = "abc"

# gives error: undefined method `f' for main:Object (NoMethodError)
f(s)

def f(x)
  print('f: ', x, "\n")
end

# works OK
f(s)
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