Loops in Ruby
Loops are programming constructs that help you repeat an action an arbitrary number of times.
are the most frequently used loops since the primary use of loops is to iterate over or transform a collection, something that we'll learn in the chapter on "Arrays in Ruby."
Here we will cover two basic looping constructs you can use to solve most other looping requirements that may come up.
Infinite loops keep running till you explicitly ask them to stop. They are syntactically the simplest to write. Here goes one:
loop do puts "this line will be executed for an infinite amount of time" end
The example above does not have a termination condition and hence will run till the process is stopped.
A loop can be halted from within using the
Now write an infinite loop where the monk will meditate till he achieves Nirvana.
break statement once Nirvana is reached.
Run a block of code N times
Say N is 5, let us imagine how it might look.
5.times do # do the stuff that needs to be done end
Well, we imagined it right. It is that simple!
Here is a task for you to test your newly learned looping skills. We have a bell outside our monastery that people can ring in times of need. Write a method that can ring the bell N times, where N is a parameter passed to the method.
We've only scratched the surface of the various ways in which Ruby lets you write loops. However, this should be enough for the most common use cases. Let us know if you need more!