How to make toMap and fromMap method for Enums class dart flutter?

Question

I used an enum variable in a class. Now I want to implement the toMap and fromMap methods for the class.

enter code here

enum ColorNumber { inc, dec, none }


class CounterState extends Equatable {
  int value;
  ColorNumber ColorNumber;
  CounterState({this.value, this.colorNumber});
  @override
  List<Object> get props => [value, colorNumber];

  Map<String, dynamic> toMap() {
    return {
      'value': value,
      'colorNumber': colorNumber.toMap(),   //error to toMap
    };
  }

  factory CounterState.fromMap(Map<String, dynamic> map) {
    return CounterState(
      value: map['value'],
      none: ColorNumber.fromMap(map['colorNumber']),   //error to fromMap
    );
  }

}

Answer 1

Simple store the enum as int representing thier position.

See below

Map<String, dynamic> toMap() {
    return {
      'value': value,
      'colorNumber': colorNumber.index, 
    };
  }

factory CounterState.fromMap(Map<String, dynamic> map) {
    int val = map['colorNumber'];
    return CounterState(
      value: map['value'],
      colorNumber: ColorNumber.values[val],  
    );
  }