Enum with switch pattern matching in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define an enum named Direction.

Swift

enum Direction {
    case [1]
    case south
    case east
    case west
}

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

Anorth

Bleft

Cup

Dright

Attempts:

3 left

💡 Hint

Common Mistakes

Using a direction name not listed in the enum cases.

Adding spaces or special characters in the case name.

The enum Direction should have a case named north to represent the four main directions.

2fill in blank

medium

Complete the switch statement to handle the Direction enum.

Swift

func describe(direction: Direction) -> String {
    switch direction {
    case [1]:
        return "Going north"
    default:
        return "Other direction"
    }
}

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

Anorth

Bwest

Ceast

Dsouth

Attempts:

3 left

💡 Hint

Common Mistakes

Using a case that does not exist in the enum.

Forgetting to match the case exactly.

The switch case should match the north case of the Direction enum to return the correct description.

3fill in blank

hard

Fix the error in the switch statement to correctly match the enum cases.

Swift

func action(for direction: Direction) -> String {
    switch direction {
    case .[1]:
        return "Move up"
    case .south:
        return "Move down"
    default:
        return "Stay still"
    }
}

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

Aleft

Bup

Cnorth

Dright

Attempts:

3 left

💡 Hint

Common Mistakes

Using a case name not defined in the enum.

Omitting the dot before the case name.

The enum case should be north to match the Direction enum. Using up causes an error because it is not defined.

4fill in blank

hard

Fill both blanks to create a switch that returns a message for east and west directions.

Swift

func directionMessage(_ dir: Direction) -> String {
    switch dir {
    case .[1]:
        return "Heading east"
    case .[2]:
        return "Heading west"
    default:
        return "Unknown direction"
    }
}

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

Aeast

Bnorth

Cwest

Dsouth

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the east and west cases.

Using cases not defined in the enum.

The switch cases should be east and west to return the correct messages for those directions.

5fill in blank

hard

Fill all three blanks to create a switch that returns a message for north, south, and other directions.

Swift

func travelAdvice(_ direction: Direction) -> String {
    switch direction {
    case .[1]:
        return "Go forward"
    case .[2]:
        return "Go backward"
    default:
        return "Stay put"
    }
}

let dir = Direction.[3]
print(travelAdvice(dir))

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

Anorth

Bsouth

Ceast

Dwest

Attempts:

3 left

💡 Hint

Common Mistakes

Using a direction in dir that is not handled explicitly in the switch.

Mixing up the case names in the switch.

The switch cases should be north and south to return the correct advice. The variable dir is set to north to test the function.