p">(</span><span class="s2">&quot;\n\n&quot;</span><span class="p">))</span> <span class="o">:</span> <span class="nx">chunk</span>
  <span class="k">this</span><span class="p">.</span><span class="nx">push</span><span class="p">(</span><span class="nx">buf</span><span class="p">)</span>
  <span class="k">return</span> <span class="nx">callback</span><span class="p">()</span>
<span class="p">})</span>
</pre></div>

<p>*Differences from <code>Array.prototype.map</code>:</p>
<ul>
<li>Cannot insert <code>null<