            <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="p">`</span><span class="nv">do</span><span class="p">`(</span><span class="nv">onNext</span><span class="p">:</span> <span class="p">((</span><span class="kt">Element</span><span class="p">