Why developers are in LOVE with FP? FP = writing a program only in pure functions.

https://thenextweb.com/syndication/2020/10/26/heres-why-developers-are-in-love-with-functional-programming/

All the examples from the source above:

"In simple terms, functional programming is all about building functions for immutable variables. 

In contrast, object-oriented programming is about having a relatively fixed set of functions, and you're primarily modifying or adding new variables.

Because of its nature, functional programming is great for in-demand tasks such as data analysis and machine learning."

In simple words:

a function of x = it transforms some input x into some output y

But x could be multidimensional, but one object. And y could be like x... 

So we could imagine a long deep pipe of multidimentional transformations which are built from a little" Lego bricks" that can reach the sky... with a little help of chain elements like this snippet of Python code:

def square(x):

      return x*x

Is FP stateless? 

Is OOP stateful? 

"A function with clearly declared in- and outputs is one without side effects. And a function without side effects is a pure function.

A very simple definition of functional programming is this: writing a program only in pure functions. 

Pure functions never modify variables, but only create new ones as an output. "