<(common.inc.plp)><: Html({ title => 'perl version cheat sheet', version => '1.4', keywords => [qw' perl version feature features comparison sheet cheat overview summary '], stylesheet => [qw'light dark red'], data => ['perl.inc.pl'], }); :>

Perl release summary

The most significant features introduced for recent versions of the Perl scripting language. <: my $info = Data('perl'); use feature 'signatures'; sub vname ($v) { return sprintf 'v%d%03d', unpack 'C*', $v; } sub linkversion ($v) { return showlink(sprintf('%vd', $v), '#'.vname($v)); } eval { use List::Util 'first'; use Time::Piece; use Time::Seconds; my $now = Time::Piece->new; if (my $ts = $get{at}) { $now = $now->strptime($ts, '%Y-%m-%d'); say "Compatibility details emulated for $ts."; } my $ts = $now->strftime('%F'); my @versions = sort grep { $info->{$_}{release} le $ts } keys %{$info}; # perlpolicy: «We "officially" support the two most recent stable release # series. [...] we will attempt to fix critical issues» $info->{ $versions[-2] }{versum} //= "active core support"; $info->{ $versions[-1] }{versum} //= "latest stable release"; # perlpolicy: «we will attempt to fix critical issues in the two most # recent stable 5.x release series» my $coreeol = ($now - ONE_YEAR * 3)->strftime('%F'); my $vcore = first { $info->{$_}{release} ge $coreeol } @versions; print "

Core security support is provided for 3 years"; print ", so typical users should run at least ", linkversion($_) for $vcore // (); say '.'; $info->{$vcore}{versum} //= "official security patches"; # «We encourage vendors to ship the most recent supported release of Perl # at the time of their code freeze» with debian&ubuntu having 5 years LTS my $vendoreol = ($now - ONE_YEAR * 5)->strftime('%F'); my $vdebian = first { $info->{$_}{release} ge $vendoreol && $info->{$_}{distro}{debian} } @versions; say sprintf "Stable distributions such as Debian %s maintain %s+.", $info->{$_}{distro}{debian}, linkversion($_) for $vdebian // (); $info->{$vdebian}{versum} //= "still maintained by common vendors"; # extended support given at random my $nowcmp = $now->strftime('%F'); my $vdino = first { $info->{$_}{support} ge $nowcmp } @versions; say "Enterprise platforms retain versions up to $_." for map { linkversion($_) } $vdino // (); return 1; } or Alert('Missing version recommendations', $@); say '

'; for my $vernum (reverse sort keys %{$info}) { my $verrow = $info->{$vernum}; defined $verrow->{unstable} and next unless exists $get{v}; say sprintf '
', vname($vernum); my $title = $verrow->{release} // '?'; $title .= ": $_" for $verrow->{versum} // (); say sprintf '

%vd %s

', $vernum, $title; say '
'; for (@{ $verrow->{new} }) { my ($topic, $desc, $attr) = @{$_}; if ($attr) { my $title; if (defined $attr->{experimental}) { $title = 'experimental'; } if ($attr->{dropped}) { next unless exists $get{v}; $title = sprintf 'removed in %vd', $attr->{dropped}; } elsif ($attr->{stable}) { $title .= sprintf ' until %vd', $attr->{stable}; } if ($attr->{experimental}) { $title = sprintf '%s', $attr->{experimental}, $title; $attr->{name} //= $attr->{experimental}; } if ($attr->{feature}) { my $prefix = sprintf 'feature', $attr->{feature}; $title = join ', ', $prefix, $title // (); $attr->{name} //= $attr->{feature}; } $desc .= sprintf ' (%s)', $title if $title; } my $ref = defined $attr->{name} && sprintf ' id="%s"', $attr->{name}; say sprintf '%s
%s', $ref, $topic, $desc || '
'; } say sprintf '
Unicode
v%s', $_ for $verrow->{unicode} || (); say '
'; say "
\n"; }