>
    <p>The position after this position in the underlying collection.</p>

<p>To find the position that corresponds with this index in the original,
underlying collection, use that collection&#39;s <code>index(before:)</code> method
with the <code>base</code> property.</p>

<p>The following example declares a function that returns the index of the
last even number in the passed array, if one is found. First, the
function finds the position of the last even number as a <code>ReversedIndex</code>
in a rever