Flutter小技巧总结之Map<String, dynamic> 、List<String> a-z 排序

• 字符串从 a-z 排序。

  Map<String, String> map = XXX,
  
  List<String> keys = map.keys.toList();
      // key排序
  keys.sort((a, b) {
    List<int> al = a.codeUnits;
    List<int> bl = b.codeUnits;
    for (int i = 0; i < al.length; i++) {
      if (bl.length <= i) return 1;
      if (al[i] > bl[i]) {
         return 1;
       } else if (al[i] < bl[i]) return -1;
     }
       return 0;
  });