 map uses the indices of this list as keys and the corresponding objects
as values. The <code>Map.keys</code> <a href="dart-core/Iterable-class.html">Iterable</a> iterates the indices of this list
in numerical order.</p>
<pre class="language-dart"><code>List&lt;String&gt; words = ['fee', 'fi', 'fo', 'fum'];
Map&lt;int, String&gt; map = words.asMap();
map[0] + map[1];   // 'feefi';
map.keys.toList(); // [0, 1, 2, 3]
</code></pre>
    </section>
    
    <section class="summary source-code" id="source">
     