Re: Check if one of the array elements is not empty

Just for clarification, there is a difference between an empty string("") and a string with one space(" "):

use strict;
use warnings;
use 5.010;

my @array=("", "jim"," ");

foreach my $str (@array) {
    if ($str) {
        say "perl considers the string:
-->$str<--
to be true.";

    }else {
        say "perl considers the string:
-->$str<-- 
to be false.";
    }
}

output:
perl considers the string:
--><-- 
to be false.
perl considers the string:
-->jim<--
to be true.
perl considers the string:
--> <--
to be true.
[download]

Comment on Re: Check if one of the array elements is not empty Download Code

Replies are listed 'Best First'.
Re^2: Check if one of the array elements is not empty by desemondo (Hermit) on Nov 11, 2009 at 02:37 UTC
Also, depending on how `@array` is actually populated, some elements may be `undef`ined, which perl also treats as false, and throws a warning (if `use warnings` is in effect) if you try to do anything with it... `Use of uninitialized value in concatenation (.) or string at test2.pl +line 15. perl considers the string:--><-- to be false.` [download]	[reply] [d/l] [select]