How do I remove all undefs from array?

Question

While reading from a configuration file in Perl there might be cases when a line is invalid and it does not need to get added to my array of valid lines. Since I'm using a for loop here, even the invalid lines create an undef entry. How can I remove all them afterwards?

Thanks!

if you're creating the config file use a module like Config::Simple. If you're reading the content of a pre-existing config file into an array why are you pushing invalid entries into your array instead of skipping them? — beresfordt, Jun 20 '12 at 15:42

score 56 · Accepted Answer · answered Jun 20 '12 at 15:40

56

@array = grep defined, @array;

answered Jun 20 '12 at 15:40

mob

117,087
18
149
283

simple and great solution – iWizard Dec 10 '13 at 15:15
It's working for me. Thank you for this simple solution. – Gowri Shankar Balasubramaniam Oct 27 '16 at 16:22
Interesting, I am seeing `defined(@array) is deprecated at /path/to/script.pl line X.` using perl 5.10.1 (yes I realize the year is 2021, but I gotta work with what I got) – joehep Nov 02 '21 at 13:23
Should have added this immediately, but `@array = grep {defined} @array;` works for my particular flavor of Perl. – joehep Nov 03 '21 at 12:51

How do I remove all undefs from array?

1 Answers1

Linked