aus: /user/themes/myTheme/templates/flex/news/collection/

default.html.twig

<div id="flex-objects">
  <div class="text-center">
    <input class="form-input search" type="text" placeholder="Durchsuche die News" />
    <button class="button button-primary sort asc" data-sort="name">
      Sort by Name
    </button>
  </div>

	{% set data = flex_entries.getData().toArray()|sort_by_key(title) %}
	
	{% set myLength = collection|length %}
	{{ collection|join }}
	<br><p>Debug: </p>
	{% set myFirst = collection|first %}
	{{ myFirst.title }}
	{{ collection|length }}
	<br>
	
	
	{% set myArray = collection.toArray()|sort_by_key('date')|reverse %}
	
	{% for news in myArray %}
		{{ news.title }}<br>
		{{ news.date }}<br>
	{% endfor %}
	
	
	<ul class="list">
		
	
	
    {% for object in myArray  %}
	
      <li>
        {% render object layout: layout %}
      </li>
	  
    {% endfor %}
	
  </ul>
</div>

<script>
    var options = {
        valueNames: [ 'title', 'info', 'date' ]
    };    
    var userList = new List('flex-objects', options);
</script>