title: ImmutableJS - delete element from Map
body: <p>I have a map with this structure:</p>
  
  <pre><code>{
  1: {},
  2: {}
  }
  </code></pre>
  
  <p>And I'd like to delete 2: {} from it (of course - return new collection without this). How can I do it?
  I tried this, but something is wrong:</p>
  
  <pre><code> theFormerMap.deleteIn([],2) //[] should mean that it's right in the root of the map, and 2 is the name of the object I want to get rid of
  </code></pre>