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Swift Questions Set 1:

Quiz Mode

Can we omit argument labels in Swift initializer calls?

Yes

Depends on the compiler

None of the above

Solution:

How can we check if a String is empty in Swift?

String.isNil()

String.empty

String.isEmpty()

String.isEmpty

Solution:

What are designated initializers in Swift?

Primary initializers

Ternary initializers

None of the above

Designated initializers

Solution:

What is the Swift equivalent of the do-while loop in other programming languages?

doesn't exist

do-while

repeat-while

try-while

Solution:

How do we declare type properties in Swift?

using the static keyword

using the let keyword

using the class keyword

none of the above

Solution:

Which of the following is a valid activity extension can do in Swift?

Define new subscripts

Define new nested types

Use new nested types

All of the above

Solution:

What is the process of one initializer calling another initializer called in Swift?

Initializer subclassing

Initializer chaining

Both of the above

Initializer delegation

Solution:

If a property is declared as file-private in Swift, where will it be accessible?

In the source file only

In the module and the source file

Throughout the project

None of the above

Solution:

What keyword is used in Swift to declare a function with a return type, where the caller can ignore the returned value?

discardableResult

@discardableResult

Both of the above

None of the above

Solution:

What happens if a programmer writes a failable initializer to create an implicitly unwrapped optional in Swift?

A compile-time error will occur

A runtime error will occur

No error will occur, as this is the defined behavior in Swift

No error, but this is undefined behavior in Swift

Swift Questions Set 1:

Can we omit argument labels in Swift initializer calls?

Solution:

How can we check if a String is empty in Swift?

Solution:

What are designated initializers in Swift?

Solution:

What is the Swift equivalent of the do-while loop in other programming languages?

Solution:

How do we declare type properties in Swift?

Solution:

Which of the following is a valid activity extension can do in Swift?

Solution:

What is the process of one initializer calling another initializer called in Swift?

Solution:

If a property is declared as file-private in Swift, where will it be accessible?

Solution:

What keyword is used in Swift to declare a function with a return type, where the caller can ignore the returned value?

Solution:

What happens if a programmer writes a failable initializer to create an implicitly unwrapped optional in Swift?

Solution:

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