Protocol declaration syntax in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a protocol named MyProtocol.

Swift

protocol [1] {
    // protocol requirements
}

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

AMyProtocol

Bclass

Cfunc

Dstruct

Attempts:

3 left

💡 Hint

Common Mistakes

Using keywords like class or struct instead of the protocol name.

Forgetting to write the protocol name after protocol.

The keyword protocol is followed by the protocol name, here MyProtocol.

2fill in blank

medium

Complete the code to declare a protocol with a method requirement named doSomething().

Swift

protocol Actionable {
    func [1]()
}

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

AdoSomethingElse

BperformAction

CdoSomething

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name than the one required.

Omitting the parentheses after the method name.

The protocol requires a method named doSomething().

3fill in blank

hard

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

Swift

protocol [1] {
    func start()
}

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

AStartable

BStartable}

CStartable()

DStartable;

Attempts:

3 left

💡 Hint

Common Mistakes

Adding parentheses or braces incorrectly after the protocol name.

Missing the opening brace {.

The protocol name must be followed by an opening brace { without extra characters.

4fill in blank

hard

Fill both blanks to declare a protocol named Drawable with a property requirement color of type String.

Swift

protocol [1] {
    var [2]: String { get set }
}

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

ADrawable

BDrawableProtocol

Ccolor

Dcolour

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different protocol name than Drawable.

Spelling the property name as colour instead of color.

The protocol name is Drawable and the property required is named color.

5fill in blank

hard

Fill all three blanks to declare a protocol named Resizable with a method resize(to:) that takes a Double parameter named size.

Swift

protocol [1] {
    func [2](to [3]: Double)
}

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

AResizable

Bresize

Csize

Dscale

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect protocol or method names.

Using a different parameter name than size.

The protocol is named Resizable, the method is resize, and the parameter name is size.