Loop method for infinite loops in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the loop method do in Ruby?

The loop method runs the block of code inside it repeatedly forever, creating an infinite loop unless stopped with a break.

beginner

How do you stop a loop in Ruby?

You stop a loop by using the break keyword inside the block when a certain condition is met.

beginner

Example: What will this code do?<br>

loop do
  puts "Hello"
  break
end

It will print "Hello" once and then stop because break ends the loop immediately.

intermediate

Why use loop instead of while true for infinite loops?

loop is a Ruby method designed for infinite loops and can be more readable and expressive. It also uses a block which can be clearer to write and understand.

beginner

What happens if you forget to use break inside a loop?

The program will keep running the loop forever, which can freeze or crash your program if not handled properly.

What keyword stops a loop in Ruby?

A break

B stop

C exit

D end

The break keyword immediately exits the loop.

What does this code print?<br>

loop do
  puts "Hi"
  break
end

A Prints "Hi" forever

B Prints "Hi" once

C Prints nothing

D Causes an error

The loop prints "Hi" once and then breaks out of the loop.

Which of these is a correct way to create an infinite loop in Ruby?

A if true then ... end

B for i in 1..10 do ... end

C loop do ... end

D while false do ... end

loop do ... end runs forever unless broken.

What will happen if you run loop do puts 'Hello' end without a break?

A Prints 'Hello' once

B Throws an error

C Does not print anything

D Prints 'Hello' forever

Without break, the loop runs forever printing 'Hello'.

Why might you prefer loop do over while true?

A <code>loop</code> is more readable and idiomatic in Ruby

B <code>while true</code> is faster

C <code>loop</code> cannot be broken

D There is no difference

loop is a Ruby method designed for infinite loops and is often clearer.

Explain how the loop method works in Ruby and how you can stop it.

Think about what happens inside the block and how to exit.

Describe a situation where using loop do ... end is helpful and how to avoid problems with infinite loops.

Consider real-life tasks that repeat until a condition is met.