unique method

List<E> unique([
  1. Id id(
    1. E element
    )?,
  2. bool inPlace = true
])

Will return a unique (Type) data from a list

Implementation

List<E> unique([Id Function(E element)? id, bool inPlace = true]) {
  final ids = <E>{};
  var list = inPlace ? this : List<E>.from(this);
  list.retainWhere((x) => ids.add((id != null ? id(x) : x as Id) as E));
  return list;
}