t;</span> <span>f:<span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> option</span>)</span></span> <span>&#45;&gt;</span> <span><span><span class="type-var">'b</span> list</span> option</span></code></dt><dd><p>Applies <code>f</code> to the elements of the list and returns <code>None</code> if any application results in <code>None</code> otherwise returns <code>Some list'</code>.</p></dd></dl></div></body></html>