> OO is about encapsulation and about putting conventionally functions close to the data it operates on. According to Alan Kay, the essential ingredients of OO

> OO is about encapsulation and about putting conventionally functions close to the data it operates on. According to Alan Kay, the essential ingredients of OOP are: Message passing, Encapsulation, Dynamic binding. > OOP to me means only messaging, local retention and protection and hiding of state-process, and extreme late-binding of all things. It can be done in Smalltalk and in LISP. There are possibly other systems in which this is possible, but I’m not aware of them. * https://userpage.fu-berlin.de/~ram/pub/pub_jf47ht81Ht/doc_kay_oop_en https://userpage.fu-berlin.de/~ram/pub/pub_jf47ht81Ht/doc_ka... * https://medium.com/javascript-scene/the-forgotten-history-of-oop-88d71b9b2d9f https://medium.com/javascript-scene/the-forgotten-history-of... * https://softwareengineering.stackexchange.com/questions/46592/so-what-did-alan-kay-really-mean-by-the-term-object-oriented https://softwareengineering.stackexchange.com/questions/4659... Though it's recognized that Simula invented objects: * https://www.hillelwayne.com/post/alan-kay/ https://www.hillelwayne.com/post/alan-kay/