As perlplexer points out $modifiedFiles is a HASH ref not an ARRAY ref thus the code you post is not the cause of your troubles. You wish to check if a HASH KEY exists, and here is how you do it (you need the defined otherwise the key can exist but have a value of '' or 0 which will be false). unless(blah) is the same as if(! blah) 

my $hash_ref = {};
unless ( defined $hash_ref->{'some_key'}) {
    print "some_key is not defined\n";
}

my $other_hash_ref = { 'some_key' => 0 };
if ( ! defined $other_hash_ref->{'some_key'}) {
    print "some_key is not defined\n";
} else {
    print "some_key is defined\n";
}

[download]

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print

In reply to Re: Simple array checking? by tachyon
in thread Simple array checking? by costas

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