How to fix type mismatch in dart?

Question

Dart

An error like this is thrown

A value of type 'Object?' can't be assigned to a variable of type 'Object'.

How to make an Object from an Object?

Answer 1

// nullable может быть String или null
final String? nullable = "value";
  
// Если в nullable будет null - присвоит 
// переменной nonNullable1 значение "default"
final String nonNullable1 = nullable ?? "default";
  
// Вызовет ошибку времени выполнения, 
// если в nullable будет null
final String nonNullable2 = nullable!;

null safety

Answer 2

do you have null safety, Object? implies the possibility of null, Object - no