Why protocol-oriented programming matters in Swift - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a protocol named 'Drivable'.

Swift

protocol [1] {
    func drive()
}

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ADrivable

BVehicle

CDriveable

DMovable

Attempts:

3 left

💡 Hint

Common Mistakes

Using a class or struct name instead of a protocol name.

Misspelling the protocol name.

The protocol name should be 'Drivable' to match the intended design.

2fill in blank

medium

Complete the code to make 'Car' conform to the 'Drivable' protocol.

Swift

struct Car: [1] {
    func drive() {
        print("Car is driving")
    }
}

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

AVehicle

BMovable

CDrivable

DDriveable

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong protocol name.

Forgetting to conform to the protocol.

The struct 'Car' must conform to the 'Drivable' protocol to implement the 'drive' method.

3fill in blank

hard

Fix the error in the protocol extension to provide a default implementation.

Swift

extension Drivable {
    func [1]() {
        print("Default driving behavior")
    }
}

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Adrive

BDrive

Cdriving

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name in the extension.

Capitalizing the method name incorrectly.

The method name in the extension must match the protocol's method name exactly, which is 'drive'.

4fill in blank

hard

Fill both blanks to create a protocol and a struct that uses protocol-oriented programming.

Swift

protocol [1] {
    func [2]()
}

struct Bike: [1] {
    func [2]() {
        print("Bike is moving")
    }
}

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AMovable

Bmove

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent names between protocol and struct.

Using method names that don't match the protocol.

The protocol is named 'Movable' with a method 'move()'. The struct 'Bike' conforms to 'Movable' and implements 'move()'.

5fill in blank

hard

Fill all three blanks to create a protocol with a default implementation and a struct that uses it.

Swift

protocol [1] {
    func [2]()
}

extension [1] {
    func [2]() {
        print("Default implementation")
    }
}

struct Scooter: [1] {}

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

ARideable

Bride

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching protocol names between declaration and extension.

Not matching method names exactly.

The protocol is 'Rideable' with method 'ride()'. The extension provides a default 'ride()' implementation. The struct 'Scooter' conforms to 'Rideable' and uses the default method.