Until loop in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run the loop until the counter reaches 5.

Ruby

counter = 0
until counter [1] 5
  puts counter
  counter += 1
end

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

A==

B<

C>=

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < makes the loop not run at all.

Using == stops the loop too early or infinite.

The until loop runs until the condition becomes true. Using >= means the loop stops when counter is 5 or more.

2fill in blank

medium

Complete the code to print numbers from 1 to 3 using an until loop.

Ruby

num = 1
until num [1] 3
  puts num
  num += 1
end

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

A<=

B==

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using < or <= makes the loop not run.

Using == causes an infinite loop.

The loop runs until num > 3, so it prints 1, 2, and 3.

3fill in blank

hard

Fix the error in the until loop condition to avoid an infinite loop.

Ruby

count = 10
until count [1] 1
  puts count
  count -= 1
end

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

A<

B>

C==

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using > causes the loop not to run.

Using == may cause infinite loop or skip values.

The loop runs until count < 1, which prevents an infinite loop and prints 10 down to 1.

4fill in blank

hard

Fill both blanks to create a loop that counts down from 3 to 1.

Ruby

i = 3
until i [1] 1
  puts i
  i [2] 1
end

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

A>

B<

C-=

D+=

Attempts:

3 left

💡 Hint

Common Mistakes

Using > in the condition causes the loop not to run.

Using += increases the counter, causing an infinite loop.

The loop runs until i < 1, printing 3, 2, 1. i -= 1 decreases i by 1 each time.

5fill in blank

hard

Fill all three blanks to create a loop that prints even numbers from 2 to 6.

Ruby

num = 2
until num [1] 7
  if num [2] 2 == 0
    puts num
  end
  num [3] 2
end

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

A<

B%

C+=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using < in the loop condition stops the loop immediately.

Using -= decreases num causing infinite loop or wrong numbers.

The loop runs until num > 7. The % operator checks if num is even, and num += 2 increases num by 2 each time. Prints 2, 4, 6.