What is functional programming in JavaScript?

What is functional programming in JavaScript?

Functional programming is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids changing state or mutable data. In JavaScript, it emphasizes the use of functions as first-class citizens.

Can you explain some key concepts of functional programming?

Sure! Key concepts include pure functions, higher-order functions, immutability, and first-class functions. Pure functions return the same output for the same input and have no side effects.

What are higher-order functions?

Higher-order functions are functions that can take other functions as arguments or return them as results. They allow for more abstract and flexible code.

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

Absolutely! A common example is the map function, which takes a function as an argument and applies it to each element in an array, returning a new array.

How does immutability work in functional programming?

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