No need for a void map. 
for (readdir DIR) {
  next if $_ eq "." or $_ eq "..";
  next unless -d "$base/$_" or -f _;
  push @{ -d _ ? \@dirs : \@files }, $_;
}

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Update: Excellent point by particle++. Code updated accordingly.

Makeshifts last the longest.

In reply to Re^2: Producing 2 lists from a grep call by Aristotle
in thread Producing 2 lists from a grep call by BrowserUk

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