d="val-fold_with"><a href="#val-fold_with" class="anchor"></a><code><span><span class="keyword">val</span> fold_with : 
  <span><span class="optlabel">?sleep</span>:float <span class="arrow">&#45;&gt;</span></span>
  <span><span class="optlabel">?sep</span>:string <span class="arrow">&#45;&gt;</span></span>
  <span><span><span>(<a href="../Core/index.html#type-stdin">Core.stdin</a>, <a href="../Core/index.html#type-stdout">Core.stdout</a>, <span class="type-var">'stderr</span>)</span> <a href="../Core/Cmd/i