What is meaning of defined keyword [closed]

by

  • 0 if EXPR contains undef
  • 1 if EXPR contains a valid value or reference

More Related Contents:

  1. perl XML::Simple print issue [closed]
  2. How do I use boolean variables in Perl?
  3. Doesn’t Perl include current directory in @INC by default?
  4. Why does my file content/user input not match? (missing chomp canonical) [duplicate]
  5. Scalar vs List Assignment Operator
  6. How can I check if a Perl array contains a particular value?
  7. How do you capture stderr, stdout, and the exit code all at once, in Perl?
  8. How to fix a locale setting warning from Perl
  9. How can I fire and forget a process in Perl?
  10. What’s the best way to make a deep copy of a data structure in Perl?
  11. What is the difference between new Some::Class and Some::Class->new() in Perl?
  12. Iterating hash based on the insertion order?
  13. Why can’t I match my string from standard input in Perl?
  14. What’s broken about exceptions in Perl?
  15. Delete ClearCase Views Script
  16. How to pass a variable from a child process (fork by Parallel::ForkManager)?
  17. What’s the difference between single and double quotes in Perl?
  18. How do I get the full path to a Perl script that is executing?
  19. Perl subroutine arguments
  20. How to create recursive hash of hash ? (With unlimited deep)
  21. How can I call a shell command in my Perl script?
  22. Which cpan installer is the right one? (CPAN.pm/CPANPLUS/cpanminus)
  23. How do I lock a file in Perl?
  24. How do I break out of a loop in Perl?
  25. “inappropriate ioctl for device”
  26. In Perl, how can I check from which module a given function was imported?
  27. How can I verify that a value is present in an array (list) in Perl?
  28. Perl Subroutine Prototyping — The correct way to do it
  29. Why do hash keys have different order when printing?
  30. How can I manually interpolate string escapes in a Perl string?

Leave a Comment