@wrongPasswords[4] = ();
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@wrongPasswords = ();
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That is so strange I couldve sworn I did that before. But your right!! Thank you so much syphilis.

What is the effect of the statement
    @wrongPasswords[4] = ();
on the array? If the array is dumped immediately after this statement (see Data::Dump::dd), what is its content? Why? (If this statement is run with warnings asserted, what will Perl say about the statement?)

Does the push built-in have any effect on elements already in an array to which a new element is push-ed?

If a Data::Dump::dd statement for the  @wrongPasswords array is inserted immediately before the
    print"@wrongPasswords\n";
statement, what is the content of the array, and why?

Update: This is a very belated afterthought, but it occurs to me that because programmercarlito is clearly a novice and I have no idea of his or her ability to install modules, I should rather have used Data::Dumper, which is core, in the example and not Data::Dump, which is not core.

So the use statement could be
    use Data::Dumper;
and the invocations would be
    print Dumper \@wrongPasswords;
rather than
    dd \@wrongPasswords;

If this statement is run with warnings asserted, what will Perl say about the statement?

Unfortunately, nothing... the "Scalar value @wrongPasswords[4] better written as $wrongPasswords[4]" warning you're probably referring to doesn't seem to get triggered by the assignment.

$ perl -wMstrict
my @foo;
@foo[3] = "bar";
print @foo[3], "\n";
__END__
Scalar value @foo[3] better written as $foo[3] at - line 3.
bar
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Well, yes, it seems to be trigerred by the assignment:

$  perl -wMstrict -e 'my @foo;
 @foo[3] = "bar";'
Scalar value @foo[3] better written as $foo[3] at -e line 2.
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Je suis Charlie.

Welcome! Here's how you can figure out this problem - and many others! - yourself:

• See Use strict and warnings
• Use perltidy
• See Basic debugging checklist
• See How do I post a question effectively?

Once you've done that, have a look at @wrongPasswords with Data::Dumper, as described in the Basic debugging checklist item 4. You will see that it looks something like this:

$VAR1 = [undef, undef, undef, undef, undef,
    "one", "two", "three", "four"];
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What is going on here is that the line @wrongPasswords[4] = (); isn't quite right. You're probably trying to say "initialize the array @wrongPasswords to a size of four", but that's not necessary as Perl has dynamically sized arrays (kind of like a vector in C++). Instead, in Perl, @wrongPasswords[4] is what is known as an array slice, and you're telling Perl you want to write an empty list to the index 4 of the array, so to do that, Perl automatically sizes your array to five elements and initializes them to undef (a little bit like NULL). In your loop you use push, which adds elements to the end of the array. So when you say print "@wrongPasswords\n";, what you're seeing is five empty strings (the undefs) separated by spaces, followed by the rest of the items of the array. In this case, to set up @wrongPasswords, all you need to do is write my @wrongPasswords;.