Functional Programming meets Object Orientation

• Functional programming and object-oriented programming are two different ways of looking at a problem.

• Functional programming puts special emphasis on the Verbs (Action/State/Occurence) of a program and ways to combine and manipulate them

• Object-oriented programming puts special emphasis on Nouns (Class of things) and attaches verbs to them

• Funcional Works on Verbs and Objected Oriented Works on Nouns : [FVON]

• The two pproaches are almost inverses of each other, with one being Top Down and the other Bottom Up

• Object-oriented programming approaches software by dividing code into nouns or objects. Each object has some form of identity (self/this), behavior (methods), and state (members). After identifying nouns and defining their behaviors, interactions between nouns are defined

• Functional programming approaches software as the combination of functions. It tends to decompose software into behaviors, usually in a bottom-up fashion. Functions are viewed in a mathematical sense, purely operations on their input. All variables are considered immutable

• Attributes commonly ascribed to object-oriented and functional programming