as <a href="BytesLabels.html#VALiter"><code class="code">BytesLabels.iter</code></a>, but the function is applied to the index of
    the byte as first argument and the byte itself as second
    argument.</p>
</div>
</div>

<pre id="VALmap">val map : f:(char -&gt; char) -&gt; bytes -&gt; bytes</pre><div class="info ">
<div class="info-desc">
<p><code class="code">map&nbsp;~f&nbsp;s</code> applies function <code class="code">f</code> in turn to all the bytes of <code class="code">s</code> (in
    increasing 