p>Gets an object that you can use for iterating over the keys of a Map.
Typical usage:</p>
<pre><code class="language-js"><span class="hl-2">  </span><span class="hl-1">const</span><span class="hl-2"> </span><span class="hl-3">it</span><span class="hl-2"> = </span><span class="hl-4">aMap</span><span class="hl-2">.</span><span class="hl-4">iteratorKeys</span><span class="hl-2">;</span><br/><span class="hl-2">  </span><span class="hl-8">while</span><span class="hl-2"> (</span><span class="hl-4">it</span><span