[Purdue-pm] Perl 5.32 is coming!

[Dave Jacoby]

Thank you.

On Mon, Jan 27, 2020 at 1:42 PM Mark Senn <mark at purdue.edu> wrote:

> I am _guessing_ that these might be relevant:
>
> From https://perldoc.perl.org/perlre.html#Script-Runs
>     A script run is basically a sequence of characters, all from the same
>     Unicode script (see Scripts in perlunicode), such as Latin or Greek. In
>     most places a single word would never be written in multiple scripts,
>     unless it is a spoofing attack. An infamous example, is
>         paypal.com
>     Those letters could all be Latin (as in the example just above), or
> they
>     could be all Cyrillic (except for the dot), or they could be a mixture
>     of the two. In the case of an internet address the .com would be in
>     Latin, And any Cyrillic ones would cause it to be a mixture, not a
>     script run. Someone clicking on such a link would not be directed to
> the
>     real Paypal website, but an attacker would craft a look-alike one to
>     attempt to gather sensitive information from the person.
>
> From https://perldoc.perl.org/perlrecharclass.html
>     For example, \p{Alpha} matches not just the ASCII alphabetic
> characters,
>     but any character in the entire Unicode character set considered
>     alphabetic.
>
> (I continue to like Raku (formerly known as Perl 6) better than Perl 5.)
>
> -mark
>
> Dave Jacoby <jacoby.david at gmail.com> wrote on 2020-01-27 at 17:56+00:
> |
> https://www.effectiveperlprogramming.com/2020/01/perl-v5-32-new-features/
> |
> |  And brian d foy says:
> |
> |  *    The new isa infix operator (“class instance”)
> |  *    The streamzip program comes with IO::Compress::Base, so it comes
> with
> |  perl
> |  *    Script runs are no longer experimental
> |  *    Alpha assertions are no longer experimental
> |  *    Mixed mode access to undef uses a temporary file
> |  *    "0" .. "-1" is fixed
> |  *    Modifiable contexts in constants now throw an exception
> |
> |  isa is  a thing that is used in OOP. I think current use is something
> like
> |  isa( $lafayette, 'Location' ) to shoehorn types into a language that
> didn't
> |  want them, and this simply means we can do if ( $lafayette isa
> 'Location' )
> |  { ... } , which looks nicer.
> |
> |  If you have a modern perl, you can ls *pl | streamzip > file.zip or
> |  something. I've not had reason to want that, but sure.
> |
> |  I do not understand what Script runs are, and I don't see them in the
> |  "experimental" pod. No do I understand what Alpha assertions are.
> |
> |  Similarly, "Mixed mode access to undef uses a temporary file" is a
> sentence
> |  where I can understand each individual word, and mostly what two
> adjacent
> |  words mean together, but that sentence as a whole is word salad.
> |
> |  I don't know what was broken about "0" .. "-1", but I can guess. .. is a
> |  range operator, and 0 .. 1 would give [0,1], but if you want [-1,0], you
> |  should do reverse [ -1..0 ] because the range operator doesn't do
> |  descending values. But, as Gizmo showed when we were discussing "29
> Palms",
> |  you can iterate through character values, and so I would GUESS that "0"
> ..
> |  "-1" would give a large array. Maybe? Testing.
> |
> |  Ah. It gives you the same result as 0..99. At least in 5.30.
> |
> |  "Modifiable contexts in constants now throw an exception". I can't
> remember
> |  using constants in Perl. but I think this means this: if $val is a
> constant
> |  reference to an array, that array can change, but I can't point to
> another
> |  array in $val, so now, the following code should announce itself as
> |  problematic.
> |
> |  use constant ARRAY => [1,2,3,4];
> |  push ARRAY, 5;
> |
> |  I believe I have been clear in my lack of understanding of some parts of
> |  this. The 5.31 deltas seem to point to differences between 5.31.x and
> |  5.31.y, not 5.30 and 5.31 and what will become 5.32, so we'll know more
> |  later.
> |
> |  --
> |  Dave Jacoby
> |  jacoby.david at gmail.com
> |
> |  I deal with my software the way I treat my eldritch abomination:
> |   It's not human, it's not even alive in the natural sense.
> |   It's nightmare-born and nightmare-shaped, and nightmares don't die
> easy.
> |    -- @yenzie
> |  _______________________________________________
> |  Purdue-pm mailing list
> |  Purdue-pm at pm.org
> |  https://mail.pm.org/mailman/listinfo/purdue-pm
>


-- 
Dave Jacoby
jacoby.david at gmail.com

I deal with my software the way I treat my eldritch abomination:
 It's not human, it's not even alive in the natural sense.
 It's nightmare-born and nightmare-shaped, and nightmares don't die easy.
  -- @yenzie
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