in reply to String concatenation
For example, I prefer the first one in this example. I think it feels more like reading prose.
print "Action status: $status"; # Preferred by me print 'Action status: ' . $status;
But say you're building a string to show the time. I think the first highlights the elements that are being used to build $date.
$date = join( '/', $day, $month, $year ); # Preferred by me $date = "$day/$month/$year";
And sometimes it doesn't make sense to interpolate or join and you just concatenate.
Bottom line: Go for what is most expressive, and makes the code clearest to the reader. Assume that any microseconds you shave will be insignificant.$response = $head . $html_opening . $body . $html_closing; # preferred $response = join( '', $head, $html_opening, $body, $html_closing );