Until loop in Ruby - Mini Project: Build & Apply

Counting Down with an Until Loop

📖 Scenario: Imagine you have a countdown timer for a rocket launch. You want to count down from a certain number to zero, showing each number as it goes down.

🎯 Goal: You will create a program that counts down from 5 to 0 using an until loop in Ruby.

📋 What You'll Learn

Create a variable called count and set it to 5

Create a variable called zero and set it to 0

Use an until loop that runs until count is less than zero

Inside the loop, print the current value of count

Inside the loop, decrease count by 1 each time

After the loop ends, print "Blast off!"

💡 Why This Matters

🌍 Real World

Countdowns are used in many real-world situations like rocket launches, game timers, and event reminders.

💼 Career

Understanding loops and conditions is essential for programming tasks such as automation, game development, and user interface design.

1

Set up the countdown start

Create a variable called count and set it to 5.

Ruby

# Create a variable called count and set it to 5
# Your code here

Need a hint?

Use = to assign the number 5 to the variable count.

2

Set the countdown limit

Create a variable called zero and set it to 0.

Ruby

count = 5
# Create a variable called zero and set it to 0
# Your code here

Need a hint?

This variable will be used as the stopping point for the countdown.

3

Write the until loop

Write an until loop that runs until count is less than zero. Inside the loop, print the value of count and then subtract 1 from count.

Ruby

count = 5
zero = 0
# Write an until loop that runs until count is less than zero
# Inside the loop, print count and subtract 1 from count
# Your code here

Need a hint?

The until loop runs while the condition is false. Use count -= 1 to decrease the count.

4

Print the final message

After the loop ends, print "Blast off!".

Ruby

count = 5
zero = 0
until count < zero
  puts count
  count -= 1
end
# Print "Blast off!" below
# Your code here

Need a hint?

Use puts "Blast off!" to print the final message.