sformations. The functions <code class="mendoza-code">string/ascii-upper</code> and <code class="mendoza-code">string/ascii-lower</code>
return a new string that has all character in the appropriate case.
</p>
<pre class="mendoza-codeblock"><code data-language="janet">(<span class="mdzsyn-coresym">string/ascii-upper</span> <span class="mdzsyn-string">"aBcdef--*"</span>) <span class="mdzsyn-comment">#-&gt; "ABCDEF--*"</span>
(<span class="mdzsyn-coresym">string/ascii-lower</span> <span class="mdzsyn-string">