1. What is val ? Junior A. the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation B. a read-only declaration that can be assigned exactly once and cannot be reassigned afterward C. the root supertype from which every non-nullable type ultimately descends D. an automatic conversion to a more specific type after a check, letting later code use it without manual casting
2. Which term means: "a read-only declaration that can be assigned exactly once and cannot be reassigned afterward"? Junior A. Smart cast B. val C. var D. Any
3. Which statement is correct? Junior A. val — the root supertype from which every non-nullable type ultimately descends B. val — a read-only declaration that can be assigned exactly once and cannot be reassigned afterward C. val — the type with a single value returned by functions that produce no meaningful result D. val — the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation
4. What is var ? Junior A. the type with a single value returned by functions that produce no meaningful result B. a read-only declaration that can be assigned exactly once and cannot be reassigned afterward C. the root supertype from which every non-nullable type ultimately descends D. a mutable declaration whose binding can be reassigned multiple times
5. Which term means: "a mutable declaration whose binding can be reassigned multiple times"? Junior A. var B. Any C. Type inference D. Smart cast
6. Which statement is correct? Junior A. var — an automatic conversion to a more specific type after a check, letting later code use it without manual casting B. var — the type with a single value returned by functions that produce no meaningful result C. var — a read-only declaration that can be assigned exactly once and cannot be reassigned afterward D. var — a mutable declaration whose binding can be reassigned multiple times
7. What is Type inference ? Junior A. a mutable declaration whose binding can be reassigned multiple times B. a read-only declaration that can be assigned exactly once and cannot be reassigned afterward C. the type with a single value returned by functions that produce no meaningful result D. the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation
8. Which term means: "the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation"? Junior A. Smart cast B. Unit C. Any D. Type inference
9. Which statement is correct? Junior A. Type inference — an automatic conversion to a more specific type after a check, letting later code use it without manual casting B. Type inference — a read-only declaration that can be assigned exactly once and cannot be reassigned afterward C. Type inference — the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation D. Type inference — the root supertype from which every non-nullable type ultimately descends
10. What is Smart cast ? Mid A. the root supertype from which every non-nullable type ultimately descends B. the type with a single value returned by functions that produce no meaningful result C. a read-only declaration that can be assigned exactly once and cannot be reassigned afterward D. an automatic conversion to a more specific type after a check, letting later code use it without manual casting
11. Which term means: "an automatic conversion to a more specific type after a check, letting later code use it without manual casting"? Mid A. Smart cast B. Type inference C. Any D. val
12. Which statement is correct? Mid A. Smart cast — an automatic conversion to a more specific type after a check, letting later code use it without manual casting B. Smart cast — the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation C. Smart cast — the root supertype from which every non-nullable type ultimately descends D. Smart cast — a read-only declaration that can be assigned exactly once and cannot be reassigned afterward
13. What is Any ? Mid A. the root supertype from which every non-nullable type ultimately descends B. a read-only declaration that can be assigned exactly once and cannot be reassigned afterward C. the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation D. an automatic conversion to a more specific type after a check, letting later code use it without manual casting
14. Which term means: "the root supertype from which every non-nullable type ultimately descends"? Mid A. Any B. Type inference C. val D. Smart cast
15. Which statement is correct? Mid A. Any — the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation B. Any — the root supertype from which every non-nullable type ultimately descends C. Any — the type with a single value returned by functions that produce no meaningful result D. Any — a mutable declaration whose binding can be reassigned multiple times
16. What is Unit ? Mid A. the type with a single value returned by functions that produce no meaningful result B. a mutable declaration whose binding can be reassigned multiple times C. the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation D. an automatic conversion to a more specific type after a check, letting later code use it without manual casting
17. Which term means: "the type with a single value returned by functions that produce no meaningful result"? Mid A. Smart cast B. Unit C. Type inference D. var
18. Which statement is correct? Mid A. Unit — an automatic conversion to a more specific type after a check, letting later code use it without manual casting B. Unit — the type with a single value returned by functions that produce no meaningful result C. Unit — a mutable declaration whose binding can be reassigned multiple times D. Unit — the compiler's ability to deduce a declaration's type from its initializer without an explicit annotation