What's new in Perl 5.14

Whats newin Perl 5.14

perldoc perlhist

5.10.02007−Dec−18

5.10 appearedat its 20th birthday

¿Are you using Perl >= 5.10? — Ta k e p a rt in ou r su r ve y !

saywas introduced

¿Are you using say ?

Seriously

The New History Began with

Modern Perl

Modern Perl termis often understood too widely

But its just NOT these

Thats from a bookpublished in 2009

OK, go further:perldoc perlhist

well skip all odd (not even) versions (5.11, 5.13) — they are odd dev

5.12.02010−Apr−12

¿Are you using Perl >= 5.12? — What i s YAPC?

5.14.0RC12011−Apr−20

RC — is arelease candidate

Then was RC2

And thenRC3

Well, Perl 6s wayis much longer

Perl 5.14is ready already

Whats newin Perl 5.14?

perldoc perldelta

perldelta == 5.14 – 5.12

NoticeAs described in perlpolicy, therelease of Perl 5.14.0 marks theofﬁcial end of support for Perl5.10. Users of Perl 5.10 or earliershould consider upgrading to amore recent release of Perl.

Frankly speaking,its not that easy toupdate Perls versionon existing machine

Modules are themost difﬁcult part

Do you know how to reinstalleverything easily?

1Syntax

2Security

Remember...

register_globals = off $_GET["sql"] In PHPsince version 4.2.0

Perl is secure by itself

3Incompatibilities

4Deprecations

5Performance

6 Modulesand pragmas

7Documentation

8Diagnostics

9Utilities

10Install process

11Platforms

12Internals

13Bug ﬁxes

14Опечатки

Well only take a look at syntax andregular expressions changes

(Well, its time toWelcome, Perl 6.0!)

Unicode affects bothstrings and regexes

A bell(fairy tale)

ASCII-character BELL (0x7)

In Unicode 6.0BELL — 0x1F514

Panic!

Perl is calm and wise

Perl is calm and wise. . . probably

In PerlBELL = 0x0007

In Perl BELL = 0x0007N{BELL} = 0x0007

In Perl BELL = 0x0007N{BELL} = 0x0007 0x0007 = ALERT

BELL = 0x0007N{BELL} = 0x0007 0x0007 = ALERT ALERT = "a"

BELL = 0x0007N{BELL} = 0x0007 0x0007 = ALERT ALERT = "a"N{BEL} = 0x0007

BELL = 0x0007N{BELL} = 0x0007 0x0007 = ALERT ALERT = "a"N{BEL} = 0x0007 0x1F514 — no name

0x0007 = ALERT ALERT = "a" N{BEL} = 0x0007 0x1F514 — no name 0x1F514 = N{U+1F514}

0x1F514 — no name 0x1F514 = N{U+1F514} Plans for Perl 5.16 N{BELL} = 0x1F514

N{U+1F514} Plans for Perl 5.16 N{BELL} = 0x1F514 replace existing N{BELL} with N{ALERT}, N{BEL} or "a"

use feature unicode_strings;

It brings the hope

That everything is in Unicode

How to turn 5.14 on

use v5.14;

use strict; adds itselfbehind the scene

5.10.0 v5.10.0 v5.10vector stringversion stringabbreviated — v-string

Whats new inregular expressions

(?^ . . .)

Switch off all themodiﬁers locally

"ABC" =~ /abc/i; True

"ABC" =~ /a(?^:b)c/i; False

"ABC" =~ /a(?^i:b)c/i; True

Ingenious reason

$ perl5.14.0 -‐MData::Dumper -‐Emy $x = qr/abc/; say Dumper($x)$VAR1 = qr/(?^u:abc)/; No changes after adding new modiﬁers to Perl

$ perl5.10.0 -‐MData::Dumper -‐Emy $x = qr/abc/; say Dumper($x)$VAR1 = qr/(?-‐xism:abc)/; Will be changed after adding new modiﬁers to Perl

New modiﬁers

/l ==use locale;

/u == use feature unicode_strings;

/d ~~ no locale; no feature unicode_strings;

by lt de fau /d ~~ no locale; no feature unicode_strings;

How many characters match with /d/

How many characters match with /d/ ±420

for (0x0 .. 0x10FFFF) { my $char = chr($_); say $char if $char =~ /^d$/;}

/d/ matches any symbolmarked DIGIT in Unicode

0, 1, 2, 3, 4, 5, 6, 7, 8, 9,٠ ٩ ,٨ ,٧ ,٦ ,٥ ,٤ ,٣ ,٢ ,١, ੦,੧, ੨, ੩, ੪, ੫, ੬, ੭, ੮, ੯, ૦, ૧,૨, ૩, ૪, ૫, ૬, ૭, ૮, ૯, ௦, ௧, ௨, ௩, ௪, ௫, ௬, ௭, ௮, ௯, ...

d becamea topic of arguments

/ds behaviour is stable,but contradictory d

Welcome /a

for (0x0 .. 0x10FFFF) { my $char = chr($_); say $char if $char =~ /^d$/a;}

Only 10 ASCII characters match$ perl a1.pl | wc -‐l10

/a creates ASCII versionsof the modiﬁers d, s и w

And affects both b and B

Non-destructive substitution

A substitutionthat do not change original string

use v5.14;my $version = "Perl 5.10";say $version =~ s/5.10/5.14/r; Result: Perl 5.14

my $english = "colour";my $american = $english =~ s/our/or/r;

Arrays and hashes

Extra noise chars to be removed

That featureis experimental

use v5.14;my $a = [];push $a, 3, 5, 7;

use v5.10;my $a = [];push @$a, 3, 5, 7;

(Likewise @a[1] in Perl 6)

And more

push/pop @$arrayrefpush/pop $arrayref

shift/unshift @$arrayrefshift/unshift $arrayref

splice @$arrayrefsplice $arrayref

keys/values %$hashrefkeys/values $hashref

keys/values @$arrayrefkeys/values $arrayref

each %$href / @$aref each $href / $aref

given returns the lastevaluated value

say mysub(7);sub mysub { given($_[0]) { "few" when 3; "OK" when 5; "many" when 7; "?"; }}

(For those who omitreturn keyword)

git blame

Aaron Crane, Abhijit Menon-Sen, Abigail, Ævar Arnfjörð Bjarmason, Alastair Douglas, AlexanderAlekseev, Alexander Hartmaier, Alexandr Ciornii, Alex Davies, Alex Vandiver, Ali Polatel, Allen Smith,Andreas König, Andrew Rodland, Andy Armstrong, Andy Dougherty, Aristotle Pagaltzis, Arkturuz,Arvan, A. Sinan Unur, Ben Morrow, Bo Lindbergh, Boris Ratner, Brad Gilbert, Bram, brian d foy, BrianPhillips, Casey West, Charles Bailey, Chas. Owens, Chip Salzenberg, Chris BinGOs Williams,chromatic, Craig A. Berry, Curtis Jewell, Dagﬁnn Ilmari Mannsåker, Dan Dascalescu, Dave Rolsky,David Caldwell, David Cantrell, David Golden, David Leadbeater, David Mitchell, David Wheeler, EricBrine, Father Chrysostomos, Fingle Nark, Florian Ragwitz, Frank Wiegand, Franz Fasching, GeneSullivan, George Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Grant McLean, gregor herrmann,H.Merijn Brand, Hongwen Qiu, Hugo van der Sanden, Ian Goodacre, James E Keenan, James Mastros,Jan Dubois, Jay Hannah, Jerry D. Hedden, Jesse Vincent, Jim Cromie, Jirka Hruška, John Peacock,Joshua ben Jore, Joshua Pritikin, Karl Williamson, Kevin Ryde, kmx, Lars Dɪᴇᴄᴋᴏᴡ , LarwanBerke, Leon Brocard, Leon Timmermans, Lubomir Rintel, Lukas Mai, Maik Hentsche, Marty Pauley,Marvin Humphrey, Matt Johnson, Matt S Trout, Max Maischein, Michael Breen, Michael Fig, Michael GSchwern, Michael Parker, Michael Stevens, Michael Witten, Mike Kelly, Moritz Lenz, Nicholas Clark,Nick Cleaton, Nick Johnston, Nicolas Kaiser, Niko Tyni, Noirin Shirley, Nuno Carvalho, Paul Evans,Paul Green, Paul Johnson, Paul Marquess, Peter J. Holzer, Peter John Acklam, Peter Martini, PhilippeBruhat (BooK), Piotr Fusik, Rafael Garcia-Suarez, Rainer Tammer, Reini Urban, Renee Baecker, RicardoSignes, Richard Möhn, Richard Soderberg, Rob Hoelz, Robin Barker, Ruslan Zakirov, Salvador Fandiño,Salvador Ortiz Garcia, Shlomi Fish, Sinan Unur, Sisyphus, Slaven Rezic, Steffen Müller, Steve Hay,Steven Schubiger, Steve Peters, Sullivan Beck, Tatsuhiko Miyagawa, Tim Bunce, Todd Rinaldo, TomChristiansen, Tom Hukins, Tony Cook, Tye McQueen, Vadim Konovalov, Vernon Lyon, Vincent Pit, WaltMankowski, Wolfram Humann, Yves Orton, Zefram и Zsbán Ambrus.

use v5.14 or die;

Or at least

use v5.14 or v5.12 ;-)

__END__Andrew Shitov andy@shitov.ru

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