1. What is Optional ? Junior A. an operator that supplies a default fallback when the left-hand wrapped value is empty B. a type that either holds a value or is nil, written with a trailing question mark C. a statement that unwraps a value and exits the current scope early when the value is absent D. a construct that conditionally unwraps a wrapped value into a new constant only when it is present
2. Which term means: "a type that either holds a value or is nil, written with a trailing question mark"? Junior A. Optional binding with if let B. Optional C. nil D. Nil-coalescing operator (??)
3. Which statement is correct? Junior A. Optional — a type that either holds a value or is nil, written with a trailing question mark B. Optional — the keyword representing the absence of a value for a type that may be empty C. Optional — a statement that unwraps a value and exits the current scope early when the value is absent D. Optional — an operator that supplies a default fallback when the left-hand wrapped value is empty
4. What is nil ? Junior A. an operator that supplies a default fallback when the left-hand wrapped value is empty B. a type that either holds a value or is nil, written with a trailing question mark C. a construct that conditionally unwraps a wrapped value into a new constant only when it is present D. the keyword representing the absence of a value for a type that may be empty
5. Which term means: "the keyword representing the absence of a value for a type that may be empty"? Junior A. Nil-coalescing operator (??) B. Optional C. guard let D. nil
6. Which statement is correct? Junior A. nil — an operator that supplies a default fallback when the left-hand wrapped value is empty B. nil — a construct that conditionally unwraps a wrapped value into a new constant only when it is present C. nil — the keyword representing the absence of a value for a type that may be empty D. nil — a statement that unwraps a value and exits the current scope early when the value is absent
7. What is Optional binding with if let ? Mid A. a statement that unwraps a value and exits the current scope early when the value is absent B. a type that either holds a value or is nil, written with a trailing question mark C. an operator that supplies a default fallback when the left-hand wrapped value is empty D. a construct that conditionally unwraps a wrapped value into a new constant only when it is present
8. Which term means: "a construct that conditionally unwraps a wrapped value into a new constant only when it is present"? Mid A. Nil-coalescing operator (??) B. Optional binding with if let C. guard let D. Optional
9. Which statement is correct? Mid A. Optional binding with if let — a type that either holds a value or is nil, written with a trailing question mark B. Optional binding with if let — the keyword representing the absence of a value for a type that may be empty C. Optional binding with if let — a statement that unwraps a value and exits the current scope early when the value is absent D. Optional binding with if let — a construct that conditionally unwraps a wrapped value into a new constant only when it is present
10. What is guard let ? Mid A. an operator that supplies a default fallback when the left-hand wrapped value is empty B. a construct that conditionally unwraps a wrapped value into a new constant only when it is present C. a statement that unwraps a value and exits the current scope early when the value is absent D. the keyword representing the absence of a value for a type that may be empty
11. Which term means: "a statement that unwraps a value and exits the current scope early when the value is absent"? Mid A. guard let B. Optional binding with if let C. Nil-coalescing operator (??) D. nil
12. Which statement is correct? Mid A. guard let — the keyword representing the absence of a value for a type that may be empty B. guard let — a construct that conditionally unwraps a wrapped value into a new constant only when it is present C. guard let — a statement that unwraps a value and exits the current scope early when the value is absent D. guard let — an operator that supplies a default fallback when the left-hand wrapped value is empty
13. What is Nil-coalescing operator (??) ? Junior A. a type that either holds a value or is nil, written with a trailing question mark B. an operator that supplies a default fallback when the left-hand wrapped value is empty C. the keyword representing the absence of a value for a type that may be empty D. a statement that unwraps a value and exits the current scope early when the value is absent
14. Which term means: "an operator that supplies a default fallback when the left-hand wrapped value is empty"? Junior A. Nil-coalescing operator (??) B. nil C. Optional D. Optional binding with if let
15. Which statement is correct? Junior A. Nil-coalescing operator (??) — a construct that conditionally unwraps a wrapped value into a new constant only when it is present B. Nil-coalescing operator (??) — an operator that supplies a default fallback when the left-hand wrapped value is empty C. Nil-coalescing operator (??) — the keyword representing the absence of a value for a type that may be empty D. Nil-coalescing operator (??) — a type that either holds a value or is nil, written with a trailing question mark