To remove items from a set (represented as a hash) based on a condition in Perl, you can iterate over the hash and delete items that meet the condition.
In this example,
%number_set
to represent the set, with integer keys and values both set to 1: my %number_set = (1 => 1, 2 => 1, 3 => 1, 4 => 1, 5 => 1);
.foreach
loop to iterate over the keys of the hash.%
.delete
function.use strict;
use warnings;
my %number_set = (1 => 1, 2 => 1, 3 => 1, 4 => 1, 5 => 1);
print "Original Set: ";
print join(", ", keys %number_set) . "\n";
foreach my $num (keys %number_set) {
if ($num % 2 == 0) {
delete $number_set{$num};
}
}
print "Set after removing even numbers: ";
print join(", ", keys %number_set) . "\n";
Original Set: 1, 2, 3, 4, 5 Set after removing even numbers: 1, 3, 5
In this example,
%string_set
to represent the set, with string keys and values both set to 1: my %string_set = ("apple" => 1, "banana" => 1, "orange" => 1, "kiwi" => 1);
.foreach
loop to iterate over the keys of the hash.length
function.delete
function.use strict;
use warnings;
my %string_set = ("apple" => 1, "banana" => 1, "orange" => 1, "kiwi" => 1);
print "Original Set: ";
print join(", ", keys %string_set) . "\n";
foreach my $str (keys %string_set) {
if (length($str) > 4) {
delete $string_set{$str};
}
}
print "Set after removing strings longer than 4 characters: ";
print join(", ", keys %string_set) . "\n";
Original Set: apple, banana, orange, kiwi Set after removing strings longer than 4 characters: kiwi
In this tutorial, we learned How to Remove Items from Set based on a Condition in Perl language with well detailed examples.