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my @list = ( 5, 11, 7);
my @timesthree = map { $_ *= 3 } (@list);

my @timesthree_onlyfives = map { $_ *= 3 if ($_ % 5 == 0) } (@list);

my @all_timesthree_onlyfives = 
   map { 
...
         return $_;
      }
   } (@list);