rs</a></li>
            <li><a href="polymer_app_layout.behaviors/Storage-class.html">Storage</a></li>
            <li class="self-crumb">containsKey</li>
        </ol>
        <div class="title-description">
            <h1 class="title">
                <div class="kind">method</div> containsKey
            </h1>
            <!-- p class="subtitle">
                Returns true if this map contains the given <code class="prettyprint lang-dart">key</code>.
            </p -->
        </div>
        <ul cla