flutter - 如何在DartFlutter中按字母顺序对Set String进行排序？

Set reasons = {
  'Peter',
  'John',
  'James',
  'Luke',
}

import 'dart:collection';
void main() {
​
sort();
}
​
​
  void sort() {
    final sortedSet = SplayTreeSet.from(
      {'Peter', 'John', 'James', 'Luke'},
      // Comparison function not necessary here, but shown for demonstrative purposes
      (a, b) => a.compareTo(b),
    );
    print("hh()            ${sortedSet}");
​
// Prints: {James, John, Luke, Peter}
  }