Nested functions in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a nested function inside the outer function.

Swift

func outer() {
    func [1]() {
        print("Hello from inner")
    }
    inner()
}

Drag options to blanks, or click blank then click option'

Aprint

Bouter

Cinner

Dcall

Attempts:

3 left

💡 Hint

Common Mistakes

Using the outer function name inside the nested function definition.

Trying to call a function that is not defined.

The nested function inside outer() is named inner. This name is used to define and call it.

2fill in blank

medium

Complete the code to return the result of the nested function.

Swift

func outer() -> Int {
    func [1]() -> Int {
        return 5
    }
    return inner()
}

Drag options to blanks, or click blank then click option'

Ainner

Bouter

Cresult

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the outer function name instead of the nested function.

Using a name not defined as a function.

The nested function inner() returns an integer, and outer() returns the result of calling inner().

3fill in blank

hard

Fix the error in the nested function call by completing the blank.

Swift

func outer() {
    func inner() {
        print("Inside inner")
    }
    [1]()
}

Drag options to blanks, or click blank then click option'

Aouter

Binner

Cprint

Dcall

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the outer function inside itself.

Using a function name that does not exist.

The nested function inner() must be called by its name inside outer().

4fill in blank

hard

Fill both blanks to create a nested function that adds two numbers and returns the sum.

Swift

func addNumbers(a: Int, b: Int) -> Int {
    func [1]() -> Int {
        return a [2] b
    }
    return sum()
}

Drag options to blanks, or click blank then click option'

Asum

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong operator like - or *.

Naming the nested function differently than the call.

The nested function is named sum and returns the addition of a and b using the + operator.

5fill in blank

hard

Fill all three blanks to create a nested function that multiplies a number by itself and returns the result.

Swift

func calculateSquare(number: Int) -> Int {
    func [1]() -> Int {
        return number [2] number
    }
    return [3]()
}

Drag options to blanks, or click blank then click option'

Asquare

B*

C+

Dmultiply

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition instead of multiplication.

Calling a function name that does not exist.

The nested function is named square, multiplies number by itself using *, and is called by square().