Depending on your real application, it may be that a dispatch table would serve you well. Consider:
use strict;
use warnings;
my %oss = (linux => \&isLinux, Windows => \&isWindows, undef => \&isOt
+her);
my @array = qw(linux Windows wibble);
exists $oss{$_} ? $oss{$_}->() : $oss{undef}->() for @array;
sub isLinux {
print "This is linux VM" . "\n";
}
sub isWindows {
print "This is a Windows VM" . "\n";
}
sub isOther {
print "I have no idea what it is" . "\n";
}
Prints:
This is linux VM
This is a Windows VM
I have no idea what it is
True laziness is hard work
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