+-,-----+
           V       |
>>-delete(---index-+-)-----------------------------------------><

Returns and deletes the member item with the specified index from the collection. If there is no item with the specified index, the Nil object is returned and no item is deletes. All elements following the deleted item will be moved up in the collection ordering and the size of the collection will be reduced by 1 element. Depending on the nature of the collection, the indexes of the moved items may be modified by the deletion.