I misused the word 'closure' in my original post. I wanted to assign the workbook to a static variable. I believe that the structure I used is a commonly idiom in Perl for making a variable static.

Yes that is old idiom, and yes, it is called a closure (Closure on Closures) because func closes over $closure_workbook, a lexical variable declared in outer scope.

The new idiom is state / use feature qw' state ';

OTOH, its not really static without this  unless(  $closure_workbook ) { if( @_ ) ... }

In reply to Re^5: variable scopes in Excel::Writer::XLSX (closure) by Anonymous Monk
in thread variable scopes in Excel::Writer::XLSX by johnrcomeau

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