my ( $rold, $rnew ) = map scalar reverse, $old, $new;

[download]

Is just a different way of saying: 

my $rold = reverse $old;
my $rnew = reverse $new;

[download]

You need to use scalar because reverse is in list context in the map expression.

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

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