From: John Feminella <johnf@...>
Date: 2011-02-28T06:06:24+09:00
Subject: Re: Creating my own method

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

Yep. Just do this:

==== begin snippet ====
def newify!(s)
  s.gsub!(/test/, "new")
end
==== end snippet ====

Now you'll get:

==== begin snippet ====
s = "here's a test string"
newify!(s)
puts s
# => "here's a new string"
==== end snippet ====

~ jf
--
John Feminella
Principal Consultant, BitsBuilder
LI: http://www.linkedin.com/in/johnxf
SO: http://stackoverflow.com/users/75170/



On Sun, Feb 27, 2011 at 15:45, Paul Sholtz <paul.sholtz@gmail.com> wrote:
> 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"?
>
> --
> Posted via http://www.ruby-forum.com/.
>
>