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Postings from March 2006
Author: larry Date: Mon Mar 27 15:45:03 2006 New Revision: 8454 Modified: doc/trunk/design/syn/S04.pod Log: Changed temp (and let) to not default to undefine() any more. Modified: doc/trunk/design/syn/S04.pod ============================================================================== --- doc/trunk/design/syn/S04.pod (original) +++ doc/trunk/design/syn/S04.pod Mon Mar 27 15:45:03 2006 @@ -12,9 +12,9 @@ Maintainer: Larry Wall <larry@wall.org> Date: 19 Aug 2004 - Last Modified: 25 Feb 2006 + Last Modified: 28 Mar 2006 Number: 4 - Version: 10 + Version: 11 This document summarizes Apocalypse 4, which covers the block and statement syntax of Perl. @@ -90,7 +90,16 @@ value will be restored only if the current block exits unsuccessfully. (See Definition of Success below for more.) C<temp> and C<let> temporize or hypotheticalize the value or the variable depending on whether you -do assignment or binding. +do assignment or binding. One other difference from Perl 5 is that +the default is not to undefine a variable. So + + temp $x; + +causes C<$x> to start with its current value. Use + + temp undefine $x; + +to get the Perl 5 behavior. =head1 Statement-ending blocks