perl-language-es

devuelve si se encontraron elementos coincidentes o no
• @a = LIST y (LIST) = LIST devuelve si la LISTA del lado derecho produjo o no escalas
Examples
Lista de valores verdaderos y falsos
use feature qw( say );
# Numbers are true if they're not equal to 0.
say 0
? 'true' : 'false'; # false
say 1
? 'true' : 'false'; # true
say 2
? 'true' : 'false'; # true
say -1
? 'true' : 'false'; # true
say 1-1
? 'true' : 'false'; # false
say 0e7
? 'true' : 'false'; # false
say -0.00
? 'true' : 'false'; # false
# Strings are true if they're not empty.
say 'a'
? 'true' : 'false'; # true
say 'false' ? 'true' : 'false'; # true
say ''
? 'true' : 'false'; # false
# Even if a string would be treated as 0 in numeric context, it's true if nonempty.
# The only exception is the string "0", which is false.
# To force numeric context add 0 to the string
say '0'
? 'true' : 'false'; # false
say '0.0'
? 'true' : 'false'; # true
say '0e0'
? 'true' : 'false'; # true
say '0 but true' ? 'true' : 'false'; # true
say '0 whargarbl' ? 'true' : 'false'; # true
say 0+'0 argarbl' ? 'true' : 'false'; # false
# Things that become numbers in scalar context are treated as numbers.
my @c = ();
my @d = (0);
say @c
? 'true' : 'false'; # false
say @d
? 'true' : 'false'; # true
# Anything undefined is false.
say undef
? 'true' : 'false'; # false
# References are always true, even if they point at something false
my @c = ();
my $d = 0;
say \@c
? 'true' : 'false'; # true
say \$d
? 'true' : 'false'; # true
say \0
? 'true' : 'false'; # true
say \''
? 'true' : 'false'; # true
Lea Verdadero y falso en línea: https://riptutorial.com/es/perl/topic/649/verdadero-y-falso
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