Append value to List
<p>I have a immutable list object, within a <code>Map</code> object, as follows:</p>

<pre><code>let initialState = Immutable.fromJS({});
state = initialState;
state = state.set("myList", Immutable.List());
</code></pre>

<p>How do I append a value to "myList", thereby updating <code>state</code>?</p>