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Filters the duplicate items from both list. Returns a new list of type T unique items.
/// Mixin containing a helper list method
mixin ListDistinct {
/// Creates a new list with the unique elements form [listOne] and [listTwo].
/// The new list is returned with the specified type [T]
List<T> distinct<T>(List<T> listOne, List<T> listTwo) {
final List<T> _newList = <T>[];
for (final T item in listTwo) {
if (_newList.contains(item)) {
return _newList;
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