title: ImmutableJS - How to sort a date in descendent order
body: <p>I have this function that sorts dates in ascendent order (from the first date to the last date), I'm using immutableJS <a href="https://facebook.github.io/immutable-js/docs/#/Map/sortBy" rel="nofollow noreferrer">https://facebook.github.io/immutable-js/docs/#/Map/sortBy</a>:</p>
  
  <pre><code>export const OrderedMapSelector = (state) =&gt; {
    if ( state.allRetrospectivesMap ) {
      return state.allRetrospectivesMap.sortBy((retro) =&gt; retro.get('date'))
    } else {
      return Map({})
    }
  }
  </code></pre>
  
  <p>I want to sort it by descendent order, from the last date to the first date. How can I do this?</p>
  
  <p>Thanks :)</p>