Terry, Here is my understanding:
You can try defined function to verify the return value in List context, you can find the return value is (undef) instead of undef once the condition is false. Because you are using @result=&yoursubName instead of $result=&yoursubName. Please correct me if I were wrong. Just refer to chapter 3.7 in "Learning Perl" 4th Edition. Thanks & Regards, Alex Wang -----Original Message----- From: terry peng [mailto:terry.p...@mail.ru] Sent: Thursday, February 10, 2011 3:14 PM To: beginners Subject: Re[2]: about return Wed, 9 Feb 2011 22:44:10 -0800 (PST) письмо от "C.DeRykus" <dery...@gmail.com>: > On Feb 9, 10:07 pm, terry.p...@mail.ru (terry peng) wrote: > > hello, > > > > when in the case "return undef" I prefer just "return" coz in list context > it will return an empty list. > > > > my $exist = ... > > if ($exist) { > > return 1; > > > > } else { > > return; > > } > > > > the code above can work, but having many lines. > > So I want: > > > > return $exist ? 1 : (...); > > > > what should be put in (...) to get the same effect as just "return" (not > return undef)? > > > > return $exist ? 1 : (); > Does return () in the caller's list context will return an undef? regards. -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/ **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS*** -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
