Stride for custom step in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a stride from 0 to 10 with a step of 2.

Swift

for number in stride(from: 0, to: 10, by: [1]) {
    print(number)
}

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

A2

B5

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using a step larger than the range, which results in fewer numbers.

Using 'to' instead of 'through' when you want to include the end number.

The stride(from:to:by:) function creates a sequence starting at 0, up to but not including 10, stepping by 2.

2fill in blank

medium

Complete the code to create a stride from 1 through 9 with a step of 2.

Swift

for number in stride(from: 1, through: 9, by: [1]) {
    print(number)
}

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

A2

B3

C4

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'to' instead of 'through' which excludes the last number.

Using a step that skips the last number.

Using stride(from:through:by:) with step 2 includes the last number 9 if it fits the sequence.

3fill in blank

hard

Fix the error in the stride to count down from 10 to 0 by 2.

Swift

for number in stride(from: 10, through: 0, by: [1]) {
    print(number)
}

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

A-1

B2

C-2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a positive step when counting down causes an infinite loop or no output.

Using -1 instead of -2 changes the step size.

When counting down, the step must be negative. Here, -2 counts down by 2.

4fill in blank

hard

Fill both blanks to create a stride from 5 to 15 with a step of 3.

Swift

for number in stride(from: [1], to: [2], by: 3) {
    print(number)
}

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

A5

B10

C15

D20

Attempts:

3 left

💡 Hint

Common Mistakes

Using 15 as the end excludes numbers up to 15.

Using 'through' instead of 'to' changes the inclusion of the end number.

The stride starts at 5 and goes up to but not including 10, stepping by 3.

5fill in blank

hard

Fill all three blanks to create a stride from 20 down to 10 with a step of 2.

Swift

for number in stride(from: [1], through: [2], by: [3]) {
    print(number)
}

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

A20

B10

C-2

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using a positive step when counting down.

Using 'to' instead of 'through' to include the end number.

The stride counts down from 20 through 10 by steps of -2.