What is functional programming in JavaScript?

Can you explain what functional programming is in JavaScript?

Functional programming is a programming paradigm that treats computation as the evaluation of mathematical functions. In JavaScript, it emphasizes the use of pure functions, higher-order functions, and immutability.

What are pure functions?

Pure functions are functions that, given the same input, will always return the same output and have no side effects, meaning they don't alter any external state.

Can you give me an example of a higher-order function?

Sure! A higher-order function is a function that takes another function as an argument or returns a function. For example, the map method in JavaScript is a higher-order function that applies a given function to each element in an array.

How does immutability work in functional programming?

Immutability means that once a data structure is created, it cannot be changed. In functional programming, instead of modifying existing data, you create new data structures with the desired changes.