From: Paul Sholtz <paul.sholtz@...>
Date: 2011-02-28T05:45:57+09:00
Subject: Creating my own method

Suppose I have a string, say s = "test string" .. the difference between
s.gsub and s.gsub! is whether or not the method modifies the object
itself. That is, s.gsub simply returns a new string w/ the appropriate
modifications, while s.gsub!(/t/,"T") will change s to a new value, to
wit, "TesT sTring"..

My question is, is there a way that I can create my own "!" methods in
Ruby?

For instance, if I have:

def f(s)
  s = "new string"
end

and then I call:

s = "test string"
f(s)
puts s

the output is still "test string"..

Is there a way that I can write a method f! so that:

def f!(s)
  s = "new string"
end

and then when I call:

s = "test string"
f!(s)
puts s

the output will be "new string"?

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