Until loop in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does an until loop do in Ruby?

An until loop repeats the code inside it as long as the condition is false. It stops when the condition becomes true.

beginner

How is an until loop different from a while loop?

An until loop runs while the condition is false, but a while loop runs while the condition is true. They are opposites.

beginner

Write a simple Ruby until loop that prints numbers from 1 to 5.

number = 1 until number > 5 puts number number += 1 end

beginner

Can an until loop run zero times? When?

Yes, if the condition is already true at the start, the until loop will not run at all.

beginner

What keyword ends an until loop block in Ruby?

The end keyword is used to close the until loop block.

What condition does an until loop check to continue running?

A Condition is zero

B Condition is true

C Condition is nil

D Condition is false

An until loop runs while the condition is false.

Which keyword ends an until loop in Ruby?

A end

B stop

C finish

D close

Ruby uses end to close blocks including until loops.

What will this code print?

count = 3
until count > 5
  puts count
  count += 1
end

A 3 4

B 4 5

C 3 4 5

D Nothing

It prints 3, 4, and 5 because the loop stops when count becomes 6 (count > 5).

If the condition is true at the start, how many times does an until loop run?

A Once

B Zero times

C Infinite times

D Twice

The until loop runs zero times if the condition is true initially.

Which loop is the opposite of until in Ruby?

A <code>while</code>

B <code>loop</code>

C <code>for</code>

D <code>each</code>

while loops run while the condition is true, opposite to until.

Explain how an until loop works in Ruby and give a simple example.

Think about repeating something until a condition becomes true.

Compare until and while loops in Ruby. When would you use each?

They are opposites but both repeat code based on conditions.