Swift Function and Closures Quiz

Test your knowledge and understanding of Swift functions and closures.

What is a function in Swift?

A way to store variables

An error handling mechanism

A named block of code that performs a specific task

A data type

None

What term is used for the values a function can accept?

Parameters

Constants

Arguments

Variables

None

In Swift, what is a method?

A constant value

A type of function associated with a class, structure, or enumeration

A closure expression

A variable type

None

How is a Swift function declared?

<return type> def <name>(<parameters>)   { ... }

func <name>(<parameters>) -> <return type> { ... }

function <name>(<parameters>) -> <return type> { ... }

method <name>(<parameters>) -> <return type> { ... }

None

What is the purpose of the func keyword in Swift function declarations?

To define a data type

To indicate the start of a closure

To specify that the block of code is a function

To declare a constant

None

What is the function signature composed of?

Return type only

Function name and parameters only

Function code only

Function name, parameters, and return type

None

How would you declare a function that does not return a result? (select all that apply)

func functionName() -> Void { ... }

func functionName() { ... }

func functionName() -> () { ... }

func functionName() -> nil { ... }

What does the 'in' keyword signify in a closure expression?

The end of the closure’s code block

The start of the closure’s code block

The beginning of a new function

The end of the parameter list

None

How can you handle multiple return values from a Swift function? (select all that apply)

By declaring multiple functions

By using a tuple

By using multiple return statements

By using an array or other collection type

10.

How are default parameter values declared in a Swift function?

By using the default keyword

By providing the default value in the parameter list

By declaring a separate function for each default value

By setting the parameter to nil

None

11.

What is the role of variadic parameters in Swift functions?

To handle fixed numbers of parameters

To specify default parameter values

To handle a variable number of parameters

To declare return types

None

12.

How can you assign a function to a constant in Swift?

By assigning it directly to a variable

By creating a new function

By using the func keyword

By declaring it with the let keyword

None

13.

What is the data type of a function that accepts an Int and a Double and returns a String?

String -> (Int, Double)

(Int) -> String

(String, Int) -> Double

(Int, Double) -> String

None

14.

Which Swift of the following is used to declare a closure?

func

closure

let

{}

None

15.

What is a key difference between a function and a closure in Swift?

Closures are only used for asynchronous tasks

Closures cannot accept parameters

Functions can only return one result; closures can return multiple results

Functions have names; closures do not

None

16.

What is a closure in the context of Swift programming?

A self-contained block of code with its own context

A data type for storing multiple values

A method within a class

A named function

None

17.

When calling a function with an in-out parameter, what prefix is required for the argument?

None

18.

In a closure expression, how do you refer to the first argument?

first

param

arg1

None

19.

Which type of function can be used as a parameter to another function in Swift?

Any function type

Method

Closure

Global function

None

20.

How do you specify a closure’s return type?

By specifying the type after {}

By declaring it as a func type

By using return keyword

By using -> followed by the type

None

21.

What is the default behavior of parameters in Swift functions if not explicitly labeled?

They must be explicitly labeled

They are considered as nil

They are not required to be labeled

They are implicitly labeled

None

22.

How do you define a closure with no parameters and no return value in Swift?

{ -> () in }

{()}

{ () -> Void in }

{}

None

23.

How are closures often used in Swift?

To declare global variables

To perform asynchronous tasks

To define methods in classes

To handle errors

None

24.

What is the syntax for defining a closure with a specific return type?

{ (parameters) -> ReturnType in }

{ ReturnType in (parameters) }

{ (parameters) ReturnType in }

{ (parameters) -> ReturnType }

None

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