For-in loop with ranges in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5.

Swift

for number in [1] {
    print(number)
}

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

A1 to 5

B1..5

C1...5

Drange(1,5)

Attempts:

3 left

💡 Hint

Common Mistakes

Using two dots instead of three dots for range.

Using Python-style range syntax.

The correct syntax for a closed range in Swift is 1...5, which includes both 1 and 5.

2fill in blank

medium

Complete the code to print numbers from 1 up to but not including 5.

Swift

for number in [1] {
    print(number)
}

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

A1..<5

Brange(1,5)

C1..5

D1...5

Attempts:

3 left

💡 Hint

Common Mistakes

Using closed range ... which includes the end value.

Using invalid range syntax.

The half-open range operator ..< includes the start but excludes the end, so 1..<5 prints 1, 2, 3, 4.

3fill in blank

hard

Fix the error in the code to print numbers from 1 to 3.

Swift

for i in [1] {
    print(i)
}

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

A1<3

B1...3

C1..3

Drange(1,3)

Attempts:

3 left

💡 Hint

Common Mistakes

Using two dots instead of three dots.

Using Python range syntax.

The correct closed range operator in Swift is ..., so 1...3 includes 1, 2, and 3.

4fill in blank

hard

Fill both blanks to create a loop that prints even numbers from 2 to 10.

Swift

for number in [1] {
    if number [2] 2 == 0 {
        print(number)
    }
}

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

A2...10

B%

C==

D2..<10

Attempts:

3 left

💡 Hint

Common Mistakes

Using half-open range which excludes 10.

Using equality operator instead of modulo.

The range 2...10 includes numbers 2 through 10. The modulo operator % checks if the number is divisible by 2 (even).

5fill in blank

hard

Fill all three blanks to create a dictionary of numbers and their squares for numbers 1 to 5, but only include squares greater than 10.

Swift

var squares = [Int: Int]()
for number in [3] {
    if number * number > 10 {
        squares[[1]] = [2]
    }
}

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

Anumber

Bnumber * number

C1...5

Dnumber * 2

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable for keys or values.

Using half-open range excluding 5.

Using multiplication by 2 instead of square.

Declare var squares as an empty dictionary of type [Int: Int]. Loop over the closed range 1...5. For each number where number * number > 10, assign squares[number] = number * number.