How to think in Functional programming paradigm?

I come from OOP background. I would like to how to think and write in FP paradigm?And when you are learning FP how do you set your mind this how we should thinking coding a program in FP and this how things work in FP.

What is functional programming?

Lately I hear a lot about Haskell and functional programming but, to be honest, I don't know anything about it. I know about Object oriented and Procedural but I don't really understand what is functional programming all about.

What is a higher kind type ?

I am coming from an OOP and learning FP and I have met alot of new concepts and this one of them. So what is a higher kind and how to achieve this with Kotlin ?

In what specific use cases would Haskell perform superior to Node.js?

Functional type classes in Swift

As an exercise I tried to declare some protocols of functional type classes in Swift, but I already failed on Functor, because protocols in Swift can't be generic. Instead of this the official recommendation is to use associatedtypes, which is often ...

What are some great features of Haskell according to experienced developers?

Being a complete beginner with Haskell, i'd love to hear praise by people writing code with it.

What was the first occasion for you to learn functional languages?

Languages like Lisp and ML are not widely used like C, Java, or many scripting languages like JavaScript. I actually digged a lot before I started to write in Clojure. I'm very curious what's the first occasion you decided to learn a functional langu...

Reusing Code in the frontend and backend

A major selling point for many frameworks these days are the ability to re-use code on the frontend and backend. NodeJS is quite vocal about this, but they are not the first. Pyjamas (Python to JS compiler): Your application's design can benefit fr...