1. What is sound null safety ? Mid A. a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance B. a type-system guarantee that non-nullable variables can never hold null, checked at compile time C. a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization D. an independent worker with its own memory and event loop, used to run heavy work off the main thread
2. Which term means: "a type-system guarantee that non-nullable variables can never hold null, checked at compile time"? Mid A. isolate B. mixin C. Future D. sound null safety
3. Which statement is correct? Mid A. sound null safety — a type-system guarantee that non-nullable variables can never hold null, checked at compile time B. sound null safety — keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code C. sound null safety — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization D. sound null safety — an object representing a single asynchronous result that completes later with a value or an error
4. What is Future ? Junior A. a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance B. an object representing a single asynchronous result that completes later with a value or an error C. an independent worker with its own memory and event loop, used to run heavy work off the main thread D. keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
5. Which term means: "an object representing a single asynchronous result that completes later with a value or an error"? Junior A. sound null safety B. late keyword C. Future D. mixin
6. Which statement is correct? Junior A. Future — keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code B. Future — an independent worker with its own memory and event loop, used to run heavy work off the main thread C. Future — an object representing a single asynchronous result that completes later with a value or an error D. Future — a type-system guarantee that non-nullable variables can never hold null, checked at compile time
7. What is async and await ? Junior A. a type-system guarantee that non-nullable variables can never hold null, checked at compile time B. keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code C. an independent worker with its own memory and event loop, used to run heavy work off the main thread D. a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
8. Which term means: "keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code"? Junior A. late keyword B. async and await C. mixin D. sound null safety
9. Which statement is correct? Junior A. async and await — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance B. async and await — an independent worker with its own memory and event loop, used to run heavy work off the main thread C. async and await — keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code D. async and await — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization
10. What is mixin ? Mid A. an independent worker with its own memory and event loop, used to run heavy work off the main thread B. a type-system guarantee that non-nullable variables can never hold null, checked at compile time C. keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code D. a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance
11. Which term means: "a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance"? Mid A. sound null safety B. async and await C. mixin D. isolate
12. Which statement is correct? Mid A. mixin — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance B. mixin — an object representing a single asynchronous result that completes later with a value or an error C. mixin — a type-system guarantee that non-nullable variables can never hold null, checked at compile time D. mixin — an independent worker with its own memory and event loop, used to run heavy work off the main thread
13. What is late keyword ? Mid A. a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization B. an object representing a single asynchronous result that completes later with a value or an error C. an independent worker with its own memory and event loop, used to run heavy work off the main thread D. keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code
14. Which term means: "a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization"? Mid A. mixin B. Future C. async and await D. late keyword
15. Which statement is correct? Mid A. late keyword — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance B. late keyword — a type-system guarantee that non-nullable variables can never hold null, checked at compile time C. late keyword — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization D. late keyword — an object representing a single asynchronous result that completes later with a value or an error
16. What is isolate ? Senior A. keywords that suspend a function until an awaited result resolves, letting you write sequential-looking asynchronous code B. an independent worker with its own memory and event loop, used to run heavy work off the main thread C. a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance D. an object representing a single asynchronous result that completes later with a value or an error
17. Which term means: "an independent worker with its own memory and event loop, used to run heavy work off the main thread"? Senior A. isolate B. async and await C. Future D. late keyword
18. Which statement is correct? Senior A. isolate — a way to reuse a class's members in multiple unrelated hierarchies without classic single inheritance B. isolate — an object representing a single asynchronous result that completes later with a value or an error C. isolate — a modifier promising a non-nullable variable will be assigned before first use, deferring its initialization D. isolate — an independent worker with its own memory and event loop, used to run heavy work off the main thread