"The fact that the functions are collected into records and called methods is irrelevant. As a result, the typical object-oriented program makes far more use of

"The fact that the functions are collected into records and called methods is irrelevant. As a result, the typical object-oriented program makes far more use of higher-order values than many func- tional programs” - William Cook, On understanding data abstraction revisited. OOP, especially with a focus on immutability, is not that far away from FP. It's not like, say physics where two domains can be conceptually quite different. OOP and FP are just two programming tools meaning that their variation is quite limited by the domain they are in.