 modify the list's length (adding or removing
elements) while an operation on the list is being performed,
for example during a call to <a href="dart-core/Iterable/forEach.html">forEach</a> or <a href="dart-core/List/sort.html">sort</a>.
Changing the list's length while it is being iterated, either by iterating it
directly or through iterating an <a href="dart-core/Iterable-class.html">Iterable</a> that is backed by the list, will
break the iteration.</p>
    </section>
    
    <section>
      <dl class="d