On Tue, Feb 01, 2005 at 05:34:18PM -0000, Steve Peters via RT wrote: > While I agree that an explanation of why "print !!0" doesn't work isn't > needed (take a look at Devel::Peek. It's your friend!), I was unable to > find actual documentation as to what values actually evaluate to TRUE or > FALSE in Perl. There is some pasing references to "", 0 and 1 in > perlop.pod. perlfaq4 deals with hashes. The rest, as I've painfully > learned in the past, are undocumented and a common source of bugs for > beginners.
perldoc perlsyn: Truth and Falsehood The number 0, the strings '0' and '', the empty list "()", and "undef" are all false in a boolean context. All other values are true. Is that sufficient? I'm not sure what you mean by "the rest". Ronald
