Easy way to print Perl array? (with a little formatting)

Question

Is there an easy way to print out a Perl array with commas in between each element?

Writing a for loop to do it is pretty easy but not quite elegant....

Answer 1

If you're coding for the kind of clarity that would be understood by someone who is just starting out with Perl, the traditional this construct says what it means, with a high degree of clarity and legibility:

$string = join ', ', @array;
print "$string\n";

This construct is documented in perldoc -fjoin.

However, I've always liked how simple $, makes it. The special variable $" is for interpolation, and the special variable $, is for lists. Combine either one with dynamic scope-constraining 'local' to avoid having ripple effects throughout the script:

use 5.012_002;
use strict;
use warnings;

my @array = qw/ 1 2 3 4 5 /;

{
    local $" = ', ';
    print "@array\n"; # Interpolation.
}

OR with $,:

use feature q(say);
use strict;
use warnings;

my @array = qw/ 1 2 3 4 5 /;
{
    local $, = ', ';
    say @array; # List
}

The special variables $, and $" are documented in perlvar. The local keyword, and how it can be used to constrain the effects of altering a global punctuation variable's value is probably best described in perlsub.

Enjoy!