"#val-fold_map" class="anchor"></a><code><span><span class="keyword">val</span> fold_map : 
  <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span>
  <span>init:<span class="type-var">'accum</span> <span class="arrow">&#45;&gt;</span></span>
  <span>f:<span>( <span><span class="type-var">'accum</span> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-elt">elt</a> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'accum</span> * <a href="#type-elt">elt</a> 