code: function(masterNodeList, index, length) {
  		var removedMappings = masterNodeList.splice(index + 1, length),
  			itemsToRemove = [];
  		removedMappings.forEach( function(nodeList) {
  
  			// Unregister to free up event bindings.
  			var nodesToRemove = nodeLists.unregister(nodeList);
  
  			// add items that we will remove all at once
  			[].push.apply(itemsToRemove, nodesToRemove);
  		});
  		return itemsToRemove;
  	}
docs: #### renderAndAddToNodeLists a helper function that renders something and adds its nodeLists to newNodeLists in the right way for stache.