dart enum
enum Status {
none,
running,
stopped,
paused
}
void main() {
print(Status.values);
Status.values.forEach((v) => print('value: $v, index: ${v.index}'));
print('running: ${Status.running}, ${Status.running.index}');
print('running index: ${Status.values[1]}');
}dart enum string
enum Enum {
enum1, enum2, enum3,
}
/// This calss does the job of converting from/to String for enum.
///
/// The alternative is to use built_value enum which kinda generates it
/// automatically.
class EnumFactory {
static final Map<String, Enum> _stringMap = {
'enum1': Enum.enum1,
'enum2': Enum.enum2,
'enum3': Enum.enum3,
};
static Enum fromString(String string) {
return _stringMap[string];
}
static String itemToString(Enum item) {
return _stringMap.keys
.firstWhere((key) => _stringMap[key] == item, orElse: () => null);
}
}Copyright © 2021 Codeinu
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