Protocol composition in Swift - Interactive Code Practice

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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ADriving

BDriveable

CDrivable

DDriver

Attempts:

3 left

💡 Hint

Common Mistakes

Using a noun instead of an adjective for the protocol name.

Misspelling the protocol name.

The protocol is named Drivable to represent something that can be driven.

2fill in blank

medium

Complete the code to declare a protocol named Flyable with a fly() method.

Swift

protocol [1] {
    func fly()
}

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AFlyable

BFlier

CFlying

DFly

Attempts:

3 left

💡 Hint

Common Mistakes

Using a noun instead of an adjective for the protocol name.

Forgetting to include the method signature.

The protocol is named Flyable to indicate the ability to fly.

3fill in blank

hard

Fix the error in the protocol composition syntax to combine Drivable and Flyable.

Swift

func operate(vehicle: [1]) {
    vehicle.drive()
    vehicle.fly()
}

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ADrivable | Flyable

BDrivable & Flyable

CDrivable, Flyable

DDrivable + Flyable

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas instead of '&' to combine protocols.

Using '|' or '+' which are invalid operators here.

In Swift, protocol composition uses the ampersand (&) to combine protocols.

4fill in blank

hard

Fill both blanks to declare a variable vehicle that conforms to both Drivable and Flyable protocols.

Swift

var vehicle: [1] = [2]()

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ADrivable & Flyable

BCarPlane

CDrivable

DFlyable

Attempts:

3 left

💡 Hint

Common Mistakes

Using only one protocol in the type annotation.

Using a class name that does not conform to both protocols.

The variable type uses protocol composition with '&', and the instance is of a class named CarPlane that conforms to both protocols.

5fill in blank

hard

Fill all three blanks to define a function testVehicle that accepts a parameter conforming to Drivable and Flyable, then calls both methods.

Swift

func testVehicle(vehicle: [1]) {
    vehicle.[2]()
    vehicle.[3]()
}

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ADrivable & Flyable

Bdrive

Cfly

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names like 'run'.

Not combining protocols correctly in the parameter type.

The parameter type uses protocol composition. The function calls the drive() and fly() methods defined in the protocols.