Dart enhanced enum parser

main.dart

import 'dart:convert';

enum ApiParam {
  foo('FOO_KEY'),
  bar('BAR_INFO'),
  baz('BAZ_THING'),
  ;
  
  final String param;
  const ApiParam(this.param);
  @override
  String toString() => param;
  static ApiParam parse(String s) =>
    ApiParam.values.firstWhere(((e) => e.toString() == s));
}

void main() {
  // send a typesafe message off to an external service with funky keys
  print(jsonEncode({ApiParam.foo.toString():'yep'}));
  
  double? bar;
  
  // receive a stringly typed message
  var d = jsonDecode('{"id":"BAR_INFO", "value":21.1}');
  ApiParam p = ApiParam.parse(d['id'] as String);
  switch (p) {
    case ApiParam.foo:
      
    case ApiParam.bar:
      bar = d['value'];
      break;
      
    case ApiParam.baz:
      
  }
  print(bar ?? '');
}