This fails to mention the most useful part of the "baby cart":<p><pre><code> "Greetings @{[ get_planet() ]}lings, we come in peace!"
</code></pre>
Evaluating functions directly inside of a string. It's sort of alluded to with "@{[ keys %hash ]}", but in doesn't come right out and say it.
Peteris Krumins wrote about some of these operators some years ago: <a href="http://www.catonmat.net/blog/secret-perl-operators" rel="nofollow">http://www.catonmat.net/blog/secret-perl-operators</a>.