ref="http://en.wikipedia.org/wiki/Whitespace_(computer_science)">whitespace</a>
test than a simple comparison with
<a href="http://en.wikipedia.org/wiki/Space_character">space</a>
(it also matches
<a href="http://en.wikipedia.org/wiki/Tab_character">tab</a>,
among others).
</li>
<li>Line 11-15:
type <i>COMMAND</i> is a structure that combines a pattern with a function.
</li>
<li>Line 17-29:
a few generic handlers.
</li>
<li>Line 26:
this loop calculates the length of the first word entered by the player;
we