Swift Function and Closures Quiz

Test your knowledge and understanding of Swift functions and closures.

What is a function in Swift?

A data type

An error handling mechanism

A named block of code that performs a specific task

A way to store variables

None

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

Parameters

Constants

Variables

Arguments

None

In Swift, what is a method?

A constant value

A closure expression

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

A variable type

None

How is a Swift function declared?

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

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

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

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

None

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

To specify that the block of code is a function

To indicate the start of a closure

To declare a constant

To define a data type

None

What is the function signature composed of?

Return type only

Function code only

Function name, parameters, and return type

Function name and parameters only

None

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

func functionName() { ... }

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

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

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

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 an array or other collection type

By using a tuple

By using multiple return statements

10.

How are default parameter values declared in a Swift function?

By providing the default value in the parameter list

By using the default keyword

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 declare return types

To specify default parameter values

To handle a variable number of parameters

None

12.

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

By using the func keyword

By assigning it directly to a variable

By creating a new function

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?

(Int, Double) -> String

(String, Int) -> Double

String -> (Int, Double)

(Int) -> String

None

14.

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

{}

let

func

closure

None

15.

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

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

Functions have names; closures do not

Closures cannot accept parameters

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 data type for storing multiple values

A self-contained block of code with its own context

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?

param

arg1

first

None

19.

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

Method

Closure

Global function

Any function type

None

20.

How do you specify a closure’s return type?

By using return keyword

By declaring it as a func type

By specifying the type after {}

By using -> followed by the type

None

21.

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

They are considered as nil

They are not required to be labeled

They are implicitly labeled

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 perform asynchronous tasks

To declare global variables

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 }

{ (parameters) -> ReturnType in }

{ ReturnType in (parameters) }

{ (parameters) -> ReturnType }

None

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