Others have offered explanations and if you'd like another example (perhaps something a little less textbook-like) I just grepped this from my scratch directory. It's hideous, yes, but demonstrates the point at hand.
Newlines added for "clarity":
print LWP::UserAgent->new()->
request(
HTTP::Request->new(GET => 'http://geeksalad.org')
)->content;
Of course, there's no error checking in there (I didn't want it at the time). That'd make it look a bit more like:
if (($_=LWP::UserAgent->new()->
request(
HTTP::Request->new(GET=>'http://geeksalad.org')
))->is_success) {
print $_->content;
}
I'm assuming, of course, that HTTP::Request isn't going to fail (unlikely anyway). And this doesn't allow me the opportunity to do anything useful with the UserAgent object other than what I could have accomplished with LWP::Simple. I have no idea why this was there, other than to serve as an example of some kind. Whether this was to demonstrate something good or bad, I can no longer remember. :)
This mess is more commonly written as something like (edited from the LWP manpage):
# Create a user agent object
use LWP::UserAgent;
$ua = new LWP::UserAgent;
my $req = new HTTP::Request POST => 'http://geeksalad.org';
my $res = $ua->request($req);
if ($res->is_success) {
print $res->content;
} else {
print "Bad luck this time\n";
}
So what my code snippet above did was exactly what's being done below, except that I don't put the request object into a variable ($req), and I don't put the user agent object ($ua) in one either. The only thing I stash away is the result ($res/$_) object because I have to call two methods (content, is_success) on it. Neither of these returns the original object, so I can't chain these together with ->'s.
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