f="#C7_L14" id=C7_L14></a><a href="#C7_L15" id=C7_L15></a><a href="#C7_L16" id=C7_L16></a><a href="#C7_L17" id=C7_L17></a><a href="#C7_L18" id=C7_L18></a><a href="#C7_L19" id=C7_L19></a></span></code></pre></div>
<p>Here, <code>indexOfSelectedTodo</code> depends on <code>todos.[]</code>, so it will update if we add an item
to <code>todos</code>, but won't update if the value of <code>isDone</code> on a <code>todo</code> changes.</p>
<p>Several of the <a href="https://api.emberjs.com/ember/3.2/classes/@ember