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Your x!! approach is nifty, but it's a little hard to read: the double-negation is confusing unless explained, and the x operator seems to be out of place in this context. I have always found one of these easier to read:

my $uri; foreach ( '', $is_admin_link && 'admin', $subsite, $mode, $id, $submode, ) { $uri.="$_/" if ( defined $_ && length($_) ) #omit undef and empties }

If you need to preserve the parts seperately:

my @part = ( '', $is_admin_link && 'admin', $subsite, $mode, $id, $submode, ); my $uri; foreach (@parts) { $uri.="$_/" if ( defined $_ && length($_) ) #omit undef and empties }

I prefer these because:

  1. The logic for inclusion of parts is clear
  2. It makes it easy to apply a common rule to all components (e.g. URL-ify components before concatenation)
  3. It avoids repetition of code
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In reply to Re: Secret Perl Operators: the boolean list squash operator, x!! by radiantmatrix
in thread Secret Perl Operators: the boolean list squash operator, x!! by Aristotle

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