Because nobody knows what $" is

Anyone who doesn't know what $" is, almost certainly won't understand @array[2,4], so you better make that:

my $output = join '', $array[2], $array[4];
[download]

But then, even if they know about the function join(), they probably won't understand the statement join, so you'd better make that:

my $output = join( '', $array[2], $array[4] );
[download]

Then, of course, for consistency you should make that last line:

print( "$output\n" );
[download]

But WFT!? Variable names inside quoted strings? That can't be right:

print( $output . "\n" );
[download]

But what the hell is that dot doing there!?

print( join( '', $output, "\n" ) );
[download]

But hang on a minute! Nested function calls!? We can sort that abomination out:

my $output2 = join( '', $output, "\n" );
print( $output2 );
[download]

my @array =
    (
    'abc', 'def', 'ghi', 'jkl', 'mno', 'pqr', 'stu', 'vwx', 'yz '
    );

my $output = join( '', $array[2], $array[4] );
my $output2 = join( '', $output, "\n" );
print( $output2 );
[download]

But, but, but, where are the classes and objects and methods and, and and ... Sod this! I'm going back to a proper language like JavaPy++ Cscript 3000 where fings are dun proply!