From: Judson Lester <nyarly@...>
Date: 2009-10-31T09:25:00+09:00
Subject: Re: In-place parameter modification

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Actually, chomp!(string) doesn't modify string, it modifies $_ (which, if I
recall correctly, is set by the -n and -p switches to ruby).

String#chomp! modifies the recipient.

Finally: ruby is a pass-by-reference language, so if you actually do make
changes the parameters of a method, the callers variables will change as
well.  For instance:

def make_bacon(string)
  string.replace "Chunky bacon."
end

hi = "hello"
make_bacon(hi)
hi #=> "Chunky bacon."

Judson

On Fri, Oct 30, 2009 at 4:38 PM, Dave Anderson <anderson@crocker.com> wrote:

> Native to ruby are several methods that change passed-in parameters
> in-place, such as chomp!(somestring). But I don't see any info on
> creating these things myself. Is it possible to write methods that
> change parameters this way?
> --
> Posted via http://www.ruby-forum.com/.
>
>

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