ode> in turn to all the bytes of <code class="code">s</code> and
    stores the resulting bytes in a new sequence that is returned as
    the result.</p>
</div>
</div>

<pre><span id="VALmapi"><span class="keyword">val</span> mapi</span> : <code class="type">f:(int -&gt; char -&gt; char) -&gt; bytes -&gt; bytes</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">mapi&nbsp;f&nbsp;s</code> calls <code class="code">f</code> with each character of <code class="code">s</code> and its
  