http://www.perlmonks.org?node_id=564874


in reply to Re: Secret Perl Operators: the boolean list squash operator, x!! (grep)
in thread Secret Perl Operators: the boolean list squash operator, x!!

How does that work out if $is_admin_link is either 0 or 1, but never undefined?

Makeshifts last the longest.

  • Comment on Re^2: Secret Perl Operators: the boolean list squash operator, x!! (grep)

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Re^3: Secret Perl Operators: the boolean list squash operator, x!! (grep)
by tye (Sage) on Jul 31, 2006 at 21:25 UTC

    $is_admin_link isn't in your list so it being defined doesn't matter. The second part of my node addresses most of your example while the first part of my node addresses the $is_admin_link part: 

    my $uri = join '/', grep defined $_,
    'http://ex­ample.net/­app',
    ( grep $is_admin_link, 'admin' ),
    $subsite, $mode, $id, $submode;

    [download]

    - tye        

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