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

A data type

An error handling mechanism

A named block of code that performs a specific task

None

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

Parameters

Variables

Arguments

Constants

None

In Swift, what is a method?

A variable type

A constant value

A closure expression

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

None

How is a Swift function declared?

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

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

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

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

None

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

To indicate the start of a closure

To specify that the block of code is a function

To declare a constant

To define a data type

None

What is the function signature composed of?

Function name and parameters only

Function code only

Return type 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 beginning of a new function

The start of the closure’s code block

The end of the parameter list

None

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

By using an array or other collection type

By using a tuple

By declaring multiple functions

By using multiple return statements

10.

How are default parameter values declared in a Swift function?

By using the default keyword

By declaring a separate function for each default value

By providing the default value in the parameter list

By setting the parameter to nil

None

11.

What is the role of variadic parameters in Swift functions?

To declare return types

To specify default parameter values

To handle fixed numbers of parameters

To handle a variable number of parameters

None

12.

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

By declaring it with the let keyword

By using the func keyword

By assigning it directly to a variable

By creating a new function

None

13.

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

(Int) -> String

(String, Int) -> Double

(Int, Double) -> String

String -> (Int, Double)

None

14.

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

{}

func

let

closure

None

15.

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

Functions have names; closures do not

Closures cannot accept parameters

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

Closures are only used for asynchronous tasks

None

16.

What is a closure in the context of Swift programming?

A method within a class

A named function

A self-contained block of code with its own context

A data type for storing multiple values

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?

param

arg1

first

None

19.

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

Method

Global function

Closure

Any function type

None

20.

How do you specify a closure’s return type?

By using return keyword

By specifying the type after {}

By declaring it as a func type

By using -> followed by the type

None

21.

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

They are not required to be labeled

They are implicitly labeled

They are considered as nil

They must be explicitly 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 define methods in classes

To handle errors

To perform asynchronous tasks

None

24.

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

{ (parameters) -> ReturnType in }

{ (parameters) ReturnType in }

{ (parameters) -> ReturnType }

{ ReturnType in (parameters) }

None

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