In perl you can think more like human, not like programmer... what you need to do? Take lines from logfile, look for names ending in "js" and list them... so you can process it like this:

#!/usr/bin/perl -CSDA 

use utf8;
use Modern::Perl;

my %h =
        map { ($_, 1) }
        grep { $_ }
        map { /([^\/]*\.js)/ && $1 }
        `cat /var/log/apache2/access.log.1`;

print map { "$_\n" } sort keys %h;
[download]

this is less readable:

#!/usr/bin/perl -CSDA 

use utf8;
use Modern::Perl;

print map { "$_\n" } sort keys %{{
        map { ($_, 1) }
        grep { $_ }
        map { /([^\/]*\.js)/ && $1 }
        `cat /var/log/apache2/access.log.1` 
}};
[download]

and use Path::Tiny if failure on file open is important:

#!/usr/bin/perl -CSDA 

use utf8;
use Modern::Perl;
use Path::Tiny;

my %h =
        map { ($_, 1) }
        grep { $_ }
        map { /([^\/]*\.js)/ && $1 }
        path('/var/log/apache2/access.log.1')->lines_utf8();

print map { "$_\n" } sort keys %h;
[download]

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