When coding objects, we want to have a great understanding of the (implicit) variable "this".
Here is some review....
So when a method comment includes text such as "our array", "our elements", "my root", ... these likely refer to ivars "array, elements, root". It will be clear by context.
But the key is understanding "this" and remembering that when we are coding a given object, that when we use the keyword "this" we can access the object's ivars and instance methods.
Chapter 103 - OO Algorithms I
Variable 'this' in Pseudocode