use<T> method
Tạo mới hoặc lấy reactive state theo key
Implementation
Reactive<T> use<T>(String key, T initialValue) {
if (_states.containsKey(key)) {
return _states[key]! as Reactive<T>;
} else {
final state = Reactive<T>(initialValue);
_states[key] = state;
return state;
}
}