urns</span><span class="p">(</span><span class="nv">param</span><span class="p">:</span> <span class="kt">String</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">String</span>
    <span class="kd">func</span> <span class="nf">simpleMehtodThatReturns</span><span class="p">(</span><span class="nv">optionalParam</span><span class="p">:</span> <span class="kt">String</span><span class="p">?)</span> <span class="o">-&gt;</span> <span class="kt">String</span><span class="p">?</span>
<s