From perlod ...

reverse LIST
In list context, returns a list value consisting of the elements of LIST in the opposite order. In scalar context, concatenates the elements of LIST and returns a string value with all characters in the opposite order.
...

And, read map chain as: map { scalar( reverse $_ ) } ( $old , $new ).

In reply to Re^3: string diff and compare by Anonymous Monk
in thread string diff and compare by raybies

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