
not be invoked. The transformed elements will not be cached. Iterating
multiple times over the returned <a href="dart-core/Iterable-class.html">Iterable</a> will invoke the supplied
function <code>f</code> multiple times on the same element.</p>
<p>Methods on the returned iterable are allowed to omit calling <code>f</code>
on any element where the result isn't needed.
For example, <a href="dart-collection/ListQueue/elementAt.html">elementAt</a> may call <code>f</code> only once.</p>
    </section>
    
   