Question

I have the below code and I’m attempting to print out only the first row of this 2d array

# how many columns
for (my $c = 0; $c <= $#list[0]; $c++) {
print $list[0][$c]."\n";

the data should be something like

[0] => "ID,Cluster,Version"
[1] => "2,32,v44"

The Error:

syntax error at ./connect_qb.pl line 107, near "$#list["
syntax error at ./connect_qb.pl line 107, near "++) "
Execution of ./connect_qb.pl aborted due to compilation errors.

Answer 1

$list[0]

is a reference to an array, so the array is

@{ $list[0] }

so the last element of that array is

$#{ $list[0] }

so you’d use

for my $c (0 .. $#{ $list[0] }) {
   print "$list[0][$c]\n";
}

or

for (@{ $list[0] }) {
   print "$_\n";
}