Generic function declaration in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a generic function named swapValues.

Swift

func swapValues<[1]>(_ a: inout [1], _ b: inout [1]) {
    let temp = a
    a = b
    b = temp
}

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

ADouble

BInt

CString

DT

Attempts:

3 left

💡 Hint

Common Mistakes

Using a concrete type like Int instead of a generic placeholder.

Forgetting to declare the generic type in angle brackets.

The generic type placeholder is usually a single uppercase letter like 'T'.

2fill in blank

medium

Complete the code to call the generic function swapValues with two integer variables.

Swift

var x = 5
var y = 10
swapValues(&[1], &y)

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Ay

Bz

Cx

Da

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a variable that is not declared.

Passing the same variable twice.

You need to pass the variable 'x' to swap with 'y'.

3fill in blank

hard

Fix the error in the generic function declaration by completing the blank.

Swift

func printValue<[1]>(value: [1]) {
    print(value)
}

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AT

BValue

CInt

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a concrete type instead of a generic placeholder.

Using a lowercase letter as a generic placeholder.

The generic type placeholder should be a single uppercase letter like 'T'.

4fill in blank

hard

Fill both blanks to declare a generic function identity that returns the same value it receives.

Swift

func identity<[1]>(_ value: [2]) -> [1] {
    return value
}

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AT

BInt

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using different types for the parameter and return type.

Using concrete types instead of the generic placeholder.

The generic placeholder 'T' is used both to declare the generic type and as the parameter type.

5fill in blank

hard

Fill all three blanks to declare a generic function compare that returns true if two values are equal.

Swift

func compare<[1]>(_ a: [2], _ b: [3]) -> Bool where [1]: Equatable {
    return a == b
}

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

AT

DU

Attempts:

3 left

💡 Hint

Common Mistakes

Using different placeholders for parameters and constraint.

Omitting the Equatable constraint.

The generic placeholder 'T' is used consistently for the type parameters and constrained to Equatable.