perl 5 quiz chemnitz edition
DESCRIPTION
Extra brutales quiz, rund um Perl 5.16, Introspektion, und einige kaum beachtete Nischen von Perl 5TRANSCRIPT
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Perl Quiz
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Kamelbuch
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Kamel
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Unterm Röntgenblick
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Was, ich bin tot?
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Perl ist überall
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Zeitgemäßes Perl
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Perl als Auto
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Perl 5 Quiz
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Perl 6 unterwegs
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Perl 6 ? - Frag mich!
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Hochstapler bei der Arbeit
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Hochstapler bei der Arbeit
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Hochstapler bei der Arbeit
Wikipedia, Perl-Wikis,Perl 6 Tablets
Perl-Magazin, Perlzeitung, heise.de
Vorträge, CPAN-Module, Kephra, WxPerlBuch
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Mansfelder Land
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Mansfelder Land
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Egypt aka Khem
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Dresden 2005
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2011
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5.14.1
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11 März 2013
Perl 5.16.3
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Mai 2013
Perl 5.18.0
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Mai 2012
Perl 5.16.0
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Richter
Perl 5.16
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Keine Entschuldigung
Perl 5.16App::perlbrew !
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Welches deref. nicht ?
each keys
join splice
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Welches deref. nicht ?
join
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Nicht Bei Jauch
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Schwierigkeit: Brutal
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Testfrage
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Was tut „less“ ?
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Das „less“ - Pragma ?
use less '...';
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Gibt es das wirklich ?
use less 'memory';
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Sicher Digger !
use less 'memory';
if ( less->of( 'CPU' ) ) { ...}elsif ( less->of( 'memory' ) ) { ...}
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Antwort:
Nichts(legacy idea)
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10 Fragen:
Aktuell: 5Introspektion: 3
Kurios: 2
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Fangen Wir An
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Frage 1 !
???
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Geht Das ?
use v5.16;use v5.8;
say 'Booh';
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Leider Ja, ...
use v5.16;use v5.8;
say 'Booh';
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..., aber nicht ab 5.18
use v5.16;use v5.8;
say 'Booh';
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Geht Das ?
Es Geht !
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Geht Das ?
Es Geht (noch) !
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Frage 2 !
???
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Was macht das ?
$[ = 1;
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Wie viele Elemente ?
my @prim;$prim[1] = 2;say scalar @prim;
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Erstes hat Index 0
$prim[1] = 2;say scalar @prim;
2
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Nun ist 1 Erster
$[ = 1;$prim[1] = 2;say scalar @prim;
1
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Unter 5.14
$[ = 1;$prim[1] = 2;say scalar @prim;
1
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Unter 5.16
Error
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Unter 5.16
use feature 'array_base';
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Unter 5.16
use v5.14;
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Frage 3 !
???
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Wie viele solcher brachte 5.16?
use feature 'array_base';
$[
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Wie viele solcher brachte 5.16?
use feature 'fc';
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Wie viele solcher brachte 5.16?
use feature 'fc';
fc $str; # fold case
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Wie viele solcher brachte 5.16?
use feature 'unicode_eval';
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Wie viele solcher brachte 5.16?
use feature 'unicode_eval';
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Sieht $str als Unicode
use feature 'unicode_eval';
eval $str;
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Sieht $str immer als Bytes
use feature 'evalbytes';
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Sieht $str immer als Bytes
use feature 'evalbytes';
evalbytes $str;
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Wie viele solcher brachte 5.16?
use feature 'current_sub';
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Referenz auf aktuelle sub
use feature 'current_sub';
__SUB__
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Geh zurück zu 5.8
use feature ':5.16';
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Geh zurück zu 5.8
use feature ':default';
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Bedeutet das Gleiche
use feature ':default';
no feature ':all';
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Wie viele solcher brachte 5.16?
8
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Wie viele solcher brachte :
5.10: 3 (3)5.12: 1 (3)5.14: 0 (1)5.16: 5 (8)
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Frage 4 !
???
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Was ergibt „undef ~~ %ash“ ?
?
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Was macht „undef ~~ %ash“ ?
7 ~~ [2,7,5]
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Was macht „undef ~~ %ash“ ?
7 ~~ [2,7,5]
1
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Was macht „undef ~~ %ash“ ?
qr/^b/ ~~ ['habe','basta']
1
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Was macht „undef ~~ %ash“ ?
undef ~~ [2,undef,5]
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Was macht „undef ~~ %ash“ ?
undef ~~ [2,undef,5]
1
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Was macht „undef ~~ %ash“ ?
2 ~~ {2 => 5}
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Was macht „undef ~~ %ash“ ?
2 ~~ {2 => 5}
1
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Was macht „undef ~~ %ash“ ?
undef ~~ {undef => 5}
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Was macht „undef ~~ %ash“ ?
undef ~~ {undef => 5}
Key ist 'undef'
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Was macht „undef ~~ %ash“ ?
undef ~~ {undef, 5}
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Was macht „undef ~~ %ash“ ?
undef ~~ {undef, 5}
trotzdem undef in Str Kontext umgewandelt
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Was macht „undef ~~ %ash“ ?
undef ~~ {undef, 5}
5 wird unter '' abgelegt say $h{''};
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Was macht „undef ~~ %ash“ ?
undef ~~ {undef, 5}
5 wird unter '' abgelegt undef ne '' (immer)
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Was macht „undef ~~ %ash“ ?
Keine Suche kann erfolgreich sein.
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Was macht „undef ~~ %ash“ ?
undef
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Frage 5 !
???
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Wohin geht COMMIT ?
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Wohin geht COMMIT ?
COMMIT
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Vollständiger Syntax
...(*COMMIT)...
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Niemals ohne !
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Zero Length Assertion
…($= ...)...…($<= ...)...
...(?(DEFINE) ...)...
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Steuern Backtracking...(*ACCEPT)......(*COMMIT)...
...(*FAIL)......(*MARK)...
...(*PRUNE)......(*SKIP)......(*THEN)...
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Unterbricht Backtrack
...(*ACCEPT)...
...(*COMMIT)...
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Unterbricht Backtrack
# Erfolg...(*ACCEPT)...
# Mißerfolg...(*COMMIT)...
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Backtracking
/d(a|ak)ch/
dackel
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'h' ne 'k'
/d(a|ak)ch/
'dackel'
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Mit COMMIT
/d(a|ak)(*COMMIT)ch/
'dackel'
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Mißerfolg
/d(a|ak)(*COMMIT)ch/
'dackel'
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Ab 5.10
Bricht Regex während Backtracking als
Mißerfolg ab
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Frage 6 !
???
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Zähl Rückgabewerte von ref ?
ref …;
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Ohne Diese:
ref $obj
'Klassen::Name'
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Referenzarten ?
?
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Referenzarten ?
SCALAR ARRAY HASH
ref \““ ref [] ref {}
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Referenzarten ?
SCALAR ARRAY HASH
CODE REF ““
ref sub {}; ref \\““; ref ““
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Referenzarten ?
SCALAR ARRAY HASH
CODE REF ““
ref qx// eq „Regexp“
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Referenzarten ?
SCALAR ARRAY HASH
CODE REF ““
ref *var{GLOB} eq “GLOB“
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Referenzarten ?
SCALAR ARRAY HASH
CODE REF ““
ref \v5.6 eq “VSTRING“
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Namen der Referenzarten ?
““ VSTRING SCALAR ARRAY HASH
IO CODE Regexp Format REF GLOB
11
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Wieviele Werte hat ref ?
11
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Frage 7 !
???
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Ref-Arten in Symboltabelle ?
?
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Ref-Arten in Symboltabelle ?
*varname{SCALAR}
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Namen der Referenzarten ?
““ VSTRING SCALAR ARRAY HASH
CODE Regexp IO Format REF GLOB
11
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Namen der Referenzarten ?
““ VSTRINGSCALAR ARRAY HASH
CODE Regexp IO Format REF GLOB
11
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Ref-Arten in Symboltabelle ?
SCALAR ARRAY HASH
CODE Regexp IO FORMAT GLOB
8
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Ref-Arten in Symboltabelle ?
SCALAR ARRAY HASH
CODE FORMAT IO GLOB
7
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Ref-Arten in Symboltabelle ?
7
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Frage 8 !
???
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Wie viele Werte liefert caller?
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Wie viele Werte liefert caller !
package, filename, line, subroutine,
hasargs, wantarray, evaltext, is_require,
hints, bitmask, hinthash
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Wie viele Werte liefert caller !
11
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Tip:
say ((caller(0))[0])
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Frage 9 !
???
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Wozu braucht man -s ?
?
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Kommandozeilenparameter
perl -s test.pl -var=2
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So NICHT !
perl test.pl -s -var=2
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So auch nicht !
perl -s -var=2 test.pl
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Nur So !!!
perl -s test.pl -var=2
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Im Programm
perl -s test.pl -var=2
say $var;2
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var Ist aber global
perl -s test.pl -var=2
also: no strict;
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Wozu braucht man -s ?
Zur Einführung von Variablen ins
Programm aus der Shell !
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Frage 10 !
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Was verändert reset ?
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Löscht alle Var
reset 'A-Z'; !!!
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Löscht alle Var
keine mit my oder state deklarierten
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Löscht alle Var
keine mit my oder state deklarierten
my $d = 5;my $e = *d{SCALAR};say $$e; # kommt nix
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Löscht alle Var
keine mit my oder state deklarierten
nur globale oder mit local
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Löscht alle Var
keine mit my oder state deklarierten
nur globale oder mit local, our
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Globale Abgeschaltet
use v5.12;use strict;
nur globale oder mit local, our
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Globale Abgeschaltet
use v5.12;no strict 'refs';
nur globale oder mit local, our
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„lokale“ sind legacy
use v5.12;no strict 'refs';
nur globale oder mit local, our
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Löscht Var in Symbolt.
reset 'A-Z';# doch ni schlimm?
nur globale oder mit local, our
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Löscht Var in Symbolt.
reset 'A-Z';# doch ni schlimm?
löscht auch: %ENV,@INC, @ISA, etc.
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Was verändert reset ?
besser: undef $var;
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Was verändert reset ?
setzt jede $var aufundef
(Zustand vor Benutzung)
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Was verändert reset ?
setzt Variablen in Symboltabelle mit
angegebenen Anfangsbuchstab
en auf undef