Tell me the difference between object oriented and functional programming ?
In object oriented programming, you define objects with fields that store data, and methods that manipulate those fields. An object oriented program is usually formulated imperatively, defining step by step instructions to complete the calculation.

In functional programming, you write the output mathematically, as a function of the inputs. A functional program is usually formulated in terms of pure functions which do not have side effects like writing to variables.
Is that what's meant with idempotency?
Not exactly. Idempotence is a property of some operations or functions that means they have the same result no matter how many times you execute them12. For example, taking the absolute value of a number is idempotent because abs(abs(x)) = abs(x) for any x.

Object oriented and functional programming are different paradigms that describe how you write your code and structure your logic. They are not directly related to idempotence, although some functions in both paradigms may be idempotent or not depending on their definition and implementation.
hey there