From: Trans <transfire@...>
Date: 2009-08-24T05:41:32+09:00
Subject: Re: 1.8.7 String#lines keeps new-line chars (say it ain't so in 1.9)



On Aug 23, 3:32 am, Brian Candler <b.cand...@pobox.com> wrote:
> Thomas Sawyer wrote:
> > Ruby 1.8.7 p72
>
> >   >> "A\nB\nC".lines.to_a
> >   => ["A\n", "B\n", "C"]
>
> > Please, tell me that's a mishap, and not how 1.9 works. I'd expect:
>
> >   >> "A\nB\nC".lines.to_a
> >   => ["A", "B", "C"]
>
> Why would you expect that? The documentation is very clear.
>
> --------------------------------------------------------------- IO#lines
>      ios.lines(sep=$/)     => anEnumerator
>      ios.lines(limit)      => anEnumerator
>      ios.lines(sep, limit) => anEnumerator
> ------------------------------------------------------------------------
>      Returns an enumerator that gives each line in _ios_. The stream
>      must be opened for reading or an +IOError+ will be raised.
>
>         f = File.new("testfile")
>         f.lines.to_a  #=> ["foo\n", "bar\n"]
>         f.rewind
>         f.lines.sort  #=> ["bar\n", "foo\n"]
>
> If it changed in 1.9, that would be another source of incompatibilities.
>
> Perhaps most importantly of all, if the newlines were stripped, there
> would be loss of data and it would be impossible to reconstruct the
> original file exactly from the members of the lines array (e.g.
> lines.join), as your example shows nicely.

I'd expect it from a StringIO, but not a String.

T.