@values = map { defined $_ ? $_ : '' } @values;

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Update: don't use map for transforming something into itself. If you're getting from a different source, though, this would be an appropriate technique.
Caution: Contents may have been coded under pressure.

In reply to Re^5: uninitialized value in join or string by Roy Johnson
in thread uninitialized value in join or string by Win

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