r">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span>)</span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> array</span> <span>&#45;&gt;</span> <span><span class="type-var">'c</span> <a href="index.html#type-t">t</a></span></code></dt><dd><p>Same as <a href="index.html#val-of_array_map"><code>of_array_map</code></a> but with the index</p></dd></dl><dl><dt class="spec value" id="val-concat_map_rev"><a href="#val-concat_map_rev" class="anchor"></a><code><span class="keyword">val