Returns true if any of the keys in the map are equal to <code>key</code>
according to the equality used by the map.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">bool containsKey(Object key) {
  return _validKey(key) &amp;&amp; _splay(key) == 0;
}</code></pre>
    </section>

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