What does .between? method means in Ruby?

Question

I have a exercise of the school and i can't resolve it. Can you help me? The problem is this:

Try using a method that takes two arguments - use the between? method to determine if the number 2 lies between the numbers 1 and 3.

I tried to find what is the .between? method but í couldn't find it. I just know that is a method

Answer 1

The method is Comparable#between?, and you can use it like this:

2.between?(1, 3)
# => true