er">inRange</span></a> (<span style="white-space:nowrap">x:<span class="type">Int</span>,</span> <span style="white-space:nowrap">y:<span class="type">Int</span></span>):<span class="type">Bool</span></code></h3><div class="doc"><p>Returns true if <code>x</code> and <code>y</code> are valid indices.</p></div></div><div class="field "><a name="indexOf"></a><h3 class="anchor"><code><a href="#indexOf"><span class="identifier">indexOf</span></a> (<span style="white-space:nowrap">val:<span class="type">T</span><