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A fuller changelog is here: http://perl5.git.perl.org/perl.git/blob/HEAD:/pod/perldelta....

There's a lot going on here, but a couple jump out at me:

* Non-destructive substitutions (with a new 'r' option)

* An experimental feature that allows you to perform operations like push, pop, splice, keys and company directly on (unblessed) array and hash references. (There's a pretty strong warning that this feature is subject to change.)

There are also enhancements for Unicode, regular expressions, exception handling and more.



Hmmm... perldoc.perl.org doesn't have 5.14 as an option yet. I assume that the 'r' option is meant to prevent things like this:

  my @list = (... stuff ...);
  my @other_list = map { s/SOMETHING//; $_ } @list;
(The result of this is that @other_list and @list are equal because the substitution destructively affects the original list.)


That's exactly why.

(Incidentally, perlcritic will warn you if you have a map that modifies $_.)


Along with that, it's also for doing things like

  my $old = "foo"; my $new = $old =~ s/foo/bar/r;
$old still contains "foo" and $new contains "bar", but inside a map should be great as well.


There's a more readable changelog here:

http://search.cpan.org/~jesse/perl-5.14.0/pod/perldelta.pod




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