 href="Belt_internalMapString.html#TYPEkey">key</a>, 'a) N.t -><br>       (<a href="Belt_internalMapString.html#TYPEkey">key</a>, 'b) N.t -> ('a -> 'b -> bool) -> bool</code></pre>
<pre><span id="VALaddMutate"><span class="keyword">val</span> addMutate</span> : <code class="type">'a <a href="Belt_internalMapString.html#TYPEt">t</a> -><br>       <a href="Belt_internalMapString.html#TYPEkey">key</a> -> 'a -> 'a <a href="Belt_internalMapString.html#TYPEt">t</a></code></pre>
<pre><span id="VALfromArray"><span c