Splitting string into an array results in an empty array

Question

For this script users can input what projects they want used as a command line argument ($opt_proj) in a csv format like this: Proj1,Proj2,Proj3

I want to split these up to get each individually, but I'm not sure why the split command won't populate my array with the projects.

Code:

my @projects;
if ( defined $opt_proj ) {
    print $opt_proj;
    my @projects=split /,/,$opt_proj;
}   
print "@projects\n";
exit;

$opt_proj contains the data and prints out Proj1,Proj2,Proj3. But, @projects appears to be empty. I have also tried printing the contents of @projects with a foreach loop and same result.

toolic · Accepted Answer · 2021-10-20 12:38:20Z

4

The problem is scope. Just remove the my keyword inside the if block:

use warnings;
use strict;

my $opt_proj = 'Proj1,Proj2,Proj3';
my @projects;
if ( defined $opt_proj ) {
    print $opt_proj, "\n";
    @projects=split /,/,$opt_proj;
}   
print "@projects\n";
exit;

This prints:

Proj1,Proj2,Proj3
Proj1 Proj2 Proj3

Your code creates a new variable @projects inside the if block which can not be seen outside the block.

edited Oct 20, 2021 at 12:38

answered Oct 19, 2021 at 13:47

toolic

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