Why Swift has no implicit fallthrough - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a message for the number 2 using a switch statement.

Swift

let number = 2
switch number {
case 1:
    print("One")
case [1]:
    print("Two")
default:
    print("Other")
}

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

A4

B3

C2

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a case value that does not match the number variable.

The case must match the value 2 to print "Two".

2fill in blank

medium

Complete the code to allow fallthrough in Swift switch cases.

Swift

let number = 1
switch number {
case 1:
    print("One")
    [1]
case 2:
    print("Two")
default:
    print("Other")
}

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

Areturn

Bfallthrough

Ccontinue

Dbreak

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'break', 'continue', or 'return' which do not allow fallthrough and may cause compile errors.

In Swift, to explicitly allow fallthrough to the next case, you must use the fallthrough keyword.

3fill in blank

hard

Fix the error in the switch statement by adding the correct keyword to allow fallthrough.

Swift

let number = 1
switch number {
case 1:
    print("One")
    [1]
case 2:
    print("Two")
default:
    print("Other")
}

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

Acontinue

Breturn

Cbreak

Dfallthrough

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'break' which stops execution instead of allowing fallthrough.

In Swift, to explicitly allow fallthrough to the next case, you must use the fallthrough keyword.

4fill in blank

hard

Fill both blanks to create a switch that prints 'Low' for 1 or 2, and 'High' for 3 or 4.

Swift

let number = 3
switch number {
case [1], [2]:
    print("Low")
default:
    print("High")
}

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

A1

B2

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using numbers that should print 'High' in the 'Low' case.

Cases can match multiple values separated by commas. Here, 1 and 2 print 'Low'.

5fill in blank

hard

Fill all three blanks to create a switch that prints 'Weekend' for Saturday and Sunday, and 'Weekday' otherwise.

Swift

let day = "Sunday"
switch day {
case [1], [2]:
    print("Weekend")
default:
    print("[3]")
}

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

A"Saturday"

B"Sunday"

CWeekday

D"Monday"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes incorrectly or mixing string and non-string values.

The weekend days are Saturday and Sunday, and the default prints 'Weekday'.