Back to blog

Unraveling Functional Programming in JavaScript ⚙️💻

Functional programming is a programming paradigm that treats computing as the evaluation of mathematical functions. This paradigm has become increasingly popular in the JavaScript development world, especially with the rise of libraries like React and Redux.

In this tutorial, we'll explore the basic principles of functional programming and how you can apply them to JavaScript.

Advertisement

Immutability

One of the main concepts in functional programming is immutability. This means that once a value is assigned to a variable, it never changes. Here's an example:

const x = 1;x = 2; // This will throw a JavaScript error

Pure Functions

A function is said to be pure if it returns a value based only on its inputs and has no side effects. Here is an example of a pure function:

function sum(a, b) {  return a + b;}

Higher Order Functions

Higher order functions are functions that can receive other functions as arguments and/or return functions. A common example of a higher-order function in JavaScript is the .map() array method:

const numbers = [1, 2, 3, 4, 5];const numbersDoubled = numbers.map(number => number * 2);// [2, 4, 6, 8, 10]

Currying

Currying is a technique in which a function with multiple arguments is transformed into a sequence of functions, each with a single argument. Here's an example of how to implement currying in JavaScript:

function sum(a) {  return function (b) {    return a + b;  };}const sumTwo = sum(2);sumTwo(3); // 5

Conclusion

Functional programming can seem intimidating at first, but with practice and study, it can become a powerful tool for writing more readable and maintainable code. I hope this guide helps you start your journey into functional programming in JavaScript!

Now that you've learned about functional programming, let's keep evolving! Read the article on Functional Programming in JavaScript - Understanding Higher Order Functions.

Advertisement

Let's go 🦅

Previous post Next post

Comments (0)

This article has no comments yet 😢. Be the first! 🚀🦅

Add comments