Protocol requirements (methods and properties) in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a protocol with a required method.

Swift

protocol Vehicle {
    func [1]()
}

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

Adrive

Brun

Cmove

DstartEngine

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names that are not descriptive of vehicle actions.

Forgetting to include parentheses for method declaration.

The protocol requires a method named 'drive' with no parameters.

2fill in blank

medium

Complete the code to declare a protocol property requirement that is gettable and settable.

Swift

protocol Person {
    var name: String { [1] }
}

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

Aget

Bset

Cget set

Dset get

Attempts:

3 left

💡 Hint

Common Mistakes

Using only 'get' which makes the property read-only.

Using 'set' alone which is invalid syntax.

The property must be both gettable and settable, so use 'get set'.

3fill in blank

hard

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

Swift

protocol Calculator {
    func calculate(_ a: Int, _ b: Int) -> [1]
}

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

ABool

BInt

CString

DVoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using Void which means no return value.

Using String or Bool which do not match the calculation result type.

The method should return an Int as it calculates a result from two Int inputs.

4fill in blank

hard

Fill both blanks to declare a protocol with a property and a method requirement.

Swift

protocol Shape {
    var area: Double { [1] }
    func [2]()
}

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

Aget

Bset

Cdraw

Dcalculate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set' for area which is usually read-only.

Choosing method names unrelated to shape actions.

The property 'area' is read-only (get), and the method 'draw' is required.

5fill in blank

hard

Fill all three blanks to declare a protocol with a gettable property, a settable property, and a method.

Swift

protocol Device {
    var model: String { [1] }
    var isOn: Bool { [2] }
    func [3]()
}

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

Aget

Bget set

CturnOn

Dset

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'set' alone for properties which is invalid.

Choosing method names unrelated to device actions.

The 'model' property is read-only (get), 'isOn' is read-write (get set), and the method is 'turnOn'.