Functional Programming vs OOP which is better?

functional programming vs object oriented programming

Functional Programming vs OOP:

In this article, we will learn about functional programming vs oop and which is better?
Let’s drive into both just enough to choose our own.


Functional Programming:

FP is all about data manipulation, emphasizes on evaluation of function, and uses immutable data.

Immutable: means when something creates, it cannot change. 

FP also follows the declarative programming model. 


Declarative programming: Declarative programming is when you write your code in a way that describes what you want to do. Sets of declarations or declarative statements, each of them have the meaning usually in the problem domain.

Imperative programming: Sequences of commands, each performs some action. But they may or may not have meaning in the problem domain.
As a result, an imperative style encourages the reader to learn the mechanics of what the system is doing. But may they give little insight into the problem which is Intended to solve.
On the other side, the declarative style helps the reader to understand the problem domain. The approach takes the system towards the solution of the problem. But it is less informative on the matter of mechanics. Declarative programming is the picture, where imperative programming is instructions for painting that picture.


Functional Programming supports parallel programming.

Parallel programming is code they, can be run simultaneously in multiple threads or processes. Parallel Programming allows you to optimize performance by running the code across multiple CPUs.


The primary element of functional programming is functions and variables. In FP, statements can execute in any order. The output of functions in FP purely relies on arguments of the function. They can be easily invoked and reused at any point.

Functional programming gives the advantages like efficiency, slow evaluation, nested functions, bug-free code.


Object-Oriented Programming: 

The essential building block that describes object-oriented languages is the objects and methodsObject-oriented programming is a programming paradigm in which you program using objects to represent things about the real world. 

OOP uses mutable data. The object can easily reuse. OOP uses when there are many things with few operations.

Object-oriented programming has four fundamentals:

  1. Abstraction (focusing on the essentials and hiding the unnecessary details)
  2. Inheritance (defining one class in terms of another)
  3. Polymorphism (combining elements to create a new entity)
  4. Encapsulation: (it allows to hiding unrelated data from users and prevents unauthorized access)

OOP follows the imperative programming model, does not support parallel programming, statements can execute in a particular order. Loops will use for iterative data.


Functional Programming Vs Object-oriented Programming:

  • FP, a state does not exist. In OOP, the state must exist.
  • FP, a function is the primary manipulation unit. In OOP, the object is the primary manipulation unit.
  • FP, the main focus of programming, is what we are doing. In OOP, the main focus of programming is how we are doing.
  • FP mainly supports abstraction over data and abstraction over behavior. OOP mainly supports the abstraction over data only.
  • FP provides high performance in processing (large data) for applications. Object-Oriented programming is not good for big data processing.
  • Functional languages are good when you have a fixed set of things. And OO languages are good when you have a fixed set of operations on things.
  • FP does not support conditional statements. OOP, conditional statements can be used like if-else statements and switch statements.
  • OOP is an excellent method to keep everything packaged up and secure from unwanted external usage. FP works well when complexity is contained.



In this summary, we noticed that OOP and FP are not mutually exclusive. They both have their own powers. After combining those, we can get good results. They’re more reliable than both. Finally, to achieve this, it is always up to the programmers or developers to pick the programming language concepts. That makes their development productive and comfortable.

 Let me know your thoughts in the comments.

If you want to learn about JavaScript DOM (Document Object Model) then read this.

See you there 😊



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