30秒学会 Dart 片段 – filterNonUnique

Filters out the non-unique values in a list.

Use Iterable.where() in combination with List.indexOf() and List.lastIndexOf() to filter out the non-unique values.

代码实现

List<T> filterNonUnique<T>(List<T> lst) {
  return lst.where((i) => lst.indexOf(i) == lst.lastIndexOf(i)).toList();
}

使用样例

filterNonUnique([1, 2, 2, 3, 4, 4, 5]); // [1, 3, 5]