Why protocol-oriented design 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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ACar

BDriveable

CDrivable

DVehicle

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a class name instead of a protocol name.

The protocol name should be 'Drivable' to match the 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")
    }
}

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AVehicle

BRunnable

CDriveable

DDrivable

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong protocol name or a class name instead.

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

3fill in blank

hard

Fix the error in the code by completing the protocol method requirement.

Swift

protocol Drivable {
    func [1]()
}

struct Bike: Drivable {
    func drive() {
        print("Bike is driving")
    }
}

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Adrive

Brun

Cstart

Dmove

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than the one required by the protocol.

The protocol requires a method named 'drive()' which must be implemented by conforming types.

4fill in blank

hard

Fill both blanks to create a protocol extension that provides a default implementation.

Swift

protocol [1] {
    func start()
}

extension [2] {
    func start() {
        print("Starting...")
    }
}

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AStartable

BRunnable

DDrivable

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for protocol and extension.

The protocol and its extension must have the same name 'Startable' to provide default behavior.

5fill in blank

hard

Fill all three blanks to create a protocol with a property and a method, then extend it with default behavior.

Swift

protocol [1] {
    var name: String { get }
    func [2]()
}

extension [3] {
    func greet() {
        print("Hello, \(name)!")
    }
}

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AGreetable

Bgreet

DDrivable

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching protocol and extension names or method names.

The protocol 'Greetable' requires a 'name' property and a 'greet()' method. The extension provides a default 'greet()' implementation.