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  1. or download this
    use warnings;
use strict;
...
for (my $ii = 0; $ii < scalar(@some_array); $ii++) {
    print "Value at position $ii: @{[$some_array[$ii] // '--undef--']}
+\n";
}
  2. or download this
    Value at position 0: 1
Value at position 1: 2
Value at position 2: --undef--
Value at position 3: 4
Value at position 4: 5