Ruby Until

The until loop in Ruby is used to execute a block of code as long as the given condition evaluates to false. The loop continues to execute until the condition becomes true.

Syntax

The syntax for the until loop in Ruby is as follows:

until condition do
  # Code to be executed
end

Here, the condition is a Boolean expression that is checked before each iteration of the loop. The do keyword is used to start the block of code that will be executed until the condition becomes true.

Example

Let's take a look at a simple example of using the until loop in Ruby:

count = 0

until count == 5 do
  puts "Count value is #{count}"
  count += 1
end

Output:

Count value is 0
Count value is 1
Count value is 2
Count value is 3
Count value is 4

Explanation

In the example above, we declare a counter variable count and set its value to 0. The until loop is then used to execute the block of code until count becomes equal to 5. Inside the loop, we print the current value of count to the console using string interpolation. Finally, we increment the value of count by 1 in each iteration. When count becomes equal to 5, the loop exits.

Use

The until loop is useful in situations where you want to keep executing a block of code until a certain condition is met. It's commonly used in game development, simulations, and other applications where you need to keep updating the state of the program until a certain goal is achieved.

Important Points

• The condition in the until loop is checked before each iteration of the loop.
• The loop continues to execute until the condition becomes true.
• The do keyword is used to start the block of code that will be executed until the condition becomes true.

Summary

In this tutorial, we've learned about the until loop in Ruby. We've seen the syntax for using the until loop, and how it can be used to execute a block of code until a certain condition becomes true. We've also seen some example code, output, and important points to keep in mind when using the until loop.