OOP & SOLID
What are the four pillars of OOP and how does Dart implement them?
Encapsulation (private fields with _prefix), Inheritance (extends), Polymorphism (override + dynamic dispat...
10 XP4m
OOP & SOLID
15 questions
Dart OOP, SOLID principles, design patterns
OOP & SOLID
What are mixins in Dart and how are they different from inheritance?
Mixins are reusable code units that can be applied to multiple classes using 'with'. They provide implement...
30 XP4m
OOP & SOLID
What is the difference between abstract class and interface in Dart?
Abstract classes can have method implementations and state; subclasses use extends and inherit them. Interf...
20 XP3m
OOP & SOLID
Why prefer composition over inheritance?
Inheritance creates tight coupling and fragile base classes — a change in the parent can break all subclass...
30 XP3m
OOP & SOLID
What are the common design patterns used in Flutter?
Flutter uses Singleton (services, GetIt), Factory (Widget.of()), Observer (Listenable, Stream, ChangeNotifi...
30 XP5m
OOP & SOLID
How do SOLID principles apply to Dart and Flutter development?
SOLID: Single Responsibility (one class, one reason to change), Open/Closed (extend don't modify), Liskov (...
40 XP6m
OOP & SOLID
How do generics work in Dart and why are they important?
Generics let you write type-safe, reusable code. List<T> works for any type while catching mismatches at co...
30 XP4m
OOP & SOLID
What are extension methods in Dart and when should you use them?
Extension methods add functionality to existing types without subclassing. 'extension StringX on String { b...
20 XP3m
OOP & SOLID
What are callable classes and operator overloading in Dart?
A callable class implements the call() method, letting instances be invoked like functions. Operator overlo...
30 XP3m
OOP & SOLID
How do enhanced enums work in Dart 3 and what patterns do they enable?
Dart 2.17+ enums can have fields, methods, constructors, and implement interfaces. Dart 3 sealed classes + ...
30 XP4m
OOP & SOLID
What is the late keyword in Dart and when should you use it?
late defers initialization of a non-nullable variable until first access. Use it for: circular dependencies...
20 XP3m
OOP & SOLID
What are Records in Dart 3 and how do they replace custom value classes?
Records are anonymous, immutable value types: (String, int) or (name: String, age: int). They have structur...
30 XP4m
OOP & SOLID
What are Isolates in Dart and how do they compare to threads?
Isolates are Dart's concurrency model — independent workers with their own memory heap. They communicate on...
40 XP5m
OOP & SOLID
How do Streams work in Dart and what is the difference between single and broadcast streams?
Streams represent asynchronous sequences of values. Single-subscription streams can have one listener (file...
40 XP5m
OOP & SOLID
What is dependency injection in Dart and how is it implemented?
DI provides dependencies from outside rather than creating them inside a class. GetIt is Flutter's go-to se...
40 XP5m