controller_rocket.dart

// inside of object use rocket extension 
RocketController().add("key",value,readOnly:true); // you can't edit it if readonly true
// or
// [add] return value
rocket.add<Type>("key",value);
// [get] return value
rocket.get<Type>("key");
// [remove]
rocket.remove("key");
// remove with condition
rocket.removeWhere((key,value)=>key.contains("ke"));