note bart [doc://map] is a looping function to apply an expression or a block to every item in a list (each item in turn assigned to $_), and collect/return the list of results. It's like: <c> my @results; foreach(@_) { push @results, &$CODE(); } return @results; </c> where <c>$CODE</c> is the expression (delimited by a comma) or block (no delimiter) in the first argument. <p>example: <c> @output = map $_*2, 1 .. 10; </c> which is identical in result to <c> @output = map { $_*2 } 1 .. 10; </c> and which return the even numbers from 2 to 20; the double of all numbers between 1 and 10. 997975 997992