From: ahoward <ahoward@...>
Date: 2003-02-04T04:54:50+09:00
Subject: Re: ruby-dev summary 19437-19455

On Tue, 4 Feb 2003, Matt Armstrong wrote:

> Minero Aoki <aamine@loveruby.net> writes:
>
> >     ARGF.each do |line|
> >       print line if line.index(once 'PATTERN')
> >     end
> >
> >   Matz considers that the better plan is to make string literal create
> >   an object only once.
>
> So long as the string is duped when modified.  E.g.
>
>     def mystring
>       'hi'
>     end
>
>     puts mystring.sub!(/h/, 'H')
> => Hi
>     puts mystring
> => hi

clearer to

  def mystring
    static 'hi'
  end

  puts mystring.sub!(/h/, 'H')  # -> Hi
  puts mystring                 # -> Hi

VS

  def mystring
    'hi'
  end

  puts mystring.sub!(/h/, 'H')  # -> Hi
  puts mystring                 # -> hi

this applies to more than only String objects.

-a



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