ten, it may reduce the efficiency of hash-based
data structures like <code>HashSet</code> or <code>HashMap</code>.</p>
<p>If a subclass overrides <a href="models/CardState/hashCode.html">hashCode</a>, it should override the
<a href="models/CardState/operator_equals.html">operator ==</a> operator as well to maintain consistency.</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code cla