Annoying 'Use of uninitialized value in concatenation' warning

[alain_desilets]

Hi folks,

I have been using 'use strict' for years, but was only recently introduced to 'use warnings'. While I find it generally useful, it tends to generate warnings in contexts where I think it shouldn't, in particular when trying to print a variable whose value is undef.

For example, consider the following code:

use strict;
use warnings;

my @some_array = (1, 2, undef, 4, 5);

for (my $ii=0; $ii < scalar(@some_array); $ii++) {
    print "Value at position $ii: $some_array[$ii]\n";
}

This code prints the elements of an array, some of which have value undef. If you run it, you get error messages

"Use of uninitialized value $some_array2 in concatenation (.) or string at etc..."

Yet, it's perfectly fine for an array to contain some values of undef. Why shouldn't I be allowed to print them?

Is there a way around this issue? Thx.