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OOP Overview

• OOP Paradigm has its roots in Simula (1960s) and Smalltalk (1970s)
• Here is a timeline of the OOP history:

• OOP in Scripting languages like JavaScript adopted OOP principles with prototypes
• Later JavaScript introduced ES6 classes for better support
• Languages like Scala, Rust and Kotlin introduced Functional-Object Hybrid Models (2010s)

OOP Pillars (A PIE)

• Abstraction → Selective inclusion of specific aspects in the solution
• Polymorphism → Dynamic selection of operations at run time, depending on the object receiving the call
• Inheritance → Reusing the implementation of previously defined classes in objects or another classes
• Encapsulation → Hiding of implementation details

OOP Languages

• Pure OOP Language → Smalltalk, Java
• Class-based OOP Languages → Java, C++, C#
• Classless/Prototype-based OOP languages → JavaScript