Why testing matters in Swift - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a test message.

Swift

print([1])

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

A"Test passed!"

BTest passed!

Ctest passed

Dprint("Test passed!")

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the quotes around the text.

Trying to print the message without quotes.

In Swift, text must be inside double quotes to be a string. So, "Test passed!" is correct.

2fill in blank

medium

Complete the code to check if a number is positive.

Swift

let number = 5
if number [1] 0 {
    print("Positive number")
}

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

A==

B<=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than symbol instead of greater than.

Using equality instead of comparison.

To check if a number is positive, it must be greater than zero, so use >.

3fill in blank

hard

Fix the error in the function to return true if input is even.

Swift

func isEven(_ number: Int) -> Bool {
    return number [1] 2 == 0
}

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

A/

B-

C*

D%

Attempts:

3 left

💡 Hint

Common Mistakes

Using division instead of modulo.

Using multiplication or subtraction by mistake.

The modulo operator % gives the remainder. If remainder is zero when divided by 2, number is even.

4fill in blank

hard

Fill both blanks to create a dictionary of word lengths for words longer than 3 letters.

Swift

let words = ["apple", "cat", "banana", "dog"]
let lengths = [word: [1] for word in words if word.[2] > 3]

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

Aword.count

Bcount

Clength

Dsize

Attempts:

3 left

💡 Hint

Common Mistakes

Using length or size which are not valid in Swift strings.

Forgetting to use .count property.

Use word.count to get the length of the word. The property count gives the number of characters.

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase keys and values greater than 2.

Swift

let data = ["a": 1, "b": 3, "c": 5]
let result = [[1]: [2] for (key, value) in data where value [3] 2]

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

Akey.uppercased()

Bvalue

C>

Dkey

Attempts:

3 left

💡 Hint

Common Mistakes

Using key instead of key.uppercased().

Using wrong comparison operators like < or ==.

Use key.uppercased() to make keys uppercase, keep value as values, and filter with > 2.