pan class="lit">'a'</span>-&gt;<span class="num">1</span>, <span class="lit">'b'</span>-&gt;<span class="num">2</span>, <span class="lit">'b'</span>-&gt;<span class="num">3</span>)
s(<span class="lit">'b'</span> -&gt; *) == Series(<span class="lit">'b'</span>-&gt;<span class="num">2</span>, <span class="lit">'b'</span>-&gt;<span class="num">3</span>, <span class="lit">'c'</span>-&gt;<span class="num">4</span>)
s(*) == s</pre><p>The <code>at</code> method returns an instance of a <a href="scalar/Scalar.html"