Dart - 如何对 Map 的键进行排序

Posted 2022-02-26 坚果技术の博客

import "dart:collection";

main() 
  final SplayTreeMap<String, Map<String,String>> st = 
      SplayTreeMap<String, Map<String,String>>();

  st["yyy"] = "should be" : "3rd";
  st["zzz"] = "should be" : "last";
  st["aaa"] = "should be" : "first";
  st["bbb"] = "should be" : "2nd";

  for (final String key in st.keys) 
    print("$key : $st[key]");
  


// Output:
// aaa : first
// bbb : 2nd
// yyy : 3rd
// zzz : last

如果您想要对​​List​​对map的键进行排序：

var sortedKeys = map.keys.toList()..sort();