s inserted between element string
representations.</p>
<p>The returned future is completed with the combined string when this stream
is done.</p>
<p>If this stream emits an error, or the call to <a href="dart-core/Object/toString.html">Object.toString</a> throws,
the returned future is completed with that error,
and processing stops.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-