Flutter Null Safety

Null Safety is a type system feature in Dart that eliminates null reference errors—the most common source of crashes in mobile apps. With null safety, variables are non-nullable by default. To allow null, you explicitly mark types with ? (e.g., String?). The compiler enforces these constraints, catching bugs at compile time instead of runtime. Example: String name = null; is a compile error (name can't be null). String? name = null; is allowed (name can be null). Before accessing name, you check: if (name != null) print(name.toUpperCase());.