Let's say, that the instance of CoffeeMaker
wants to access the condition of coffee.
In that case, we would have a problem.
In Ruby, instances of CoffeeMaker can't access
instance variables just like that.
Only the methods can access instance variables.
Let's see an example:
In the case given above, we are
getting an error undefined method condition.
In order to fix this error,
we can create a method which
will return the instance variable.
Now, the code will work,
because we added a method
called condition which is returning
the instance variable @condition.