How to Switch Blockchains on MetaMask with JavaScript

With over 10,000 blockchains currently operating, there are endless possibilities for deploying your smart contracts. For anybody to be able to use your Decentralized Application (DApp), they need to be connected to the blockchain where you've deployed ... more

How to Integrate PayPal into Your HTML, CSS, and JS Product Pages

Imagine if you had an amazing product landing page, with customers lined up to make a purchase. But your manual JavaScript payment processing with server-side scripts, Authorize.net, or 2Checkout failed you. Frustrated by being unable to make the purchase, ... more

JavaScript Comparison Operators – How to Compare Objects for Equality in JS

While coding in JavaScript, there may be times when you need to compare objects for equality. The thing is, comparing objects in JavaScript is not that straightforward. In this article, you learn three ways to compare objects for equality in JavaScript. ... more

How to Submit a Form with JavaScript – JS Submit Button Example

When building applications and websites on the internet, you’ll sometimes need your users to supply information by filling out a form. But then you might wonder – how do you get this data from the form? Well, you can do this with JavaScript. In this ... more

Line Charts Tutorial – How to Create a Line Graph in JavaScript

Data visualization is a vast field with so many different types of charts [https://datavizcatalogue.com/] to learn and create. But there are several basic, evergreen graphs that every data designer and web developer dealing with analytics should know ... more

Intro to Deno – Guide for Beginners

What is Deno? Deno is a new JavaScript runtime. It was built by Ryan Dahl, the creator of Node.js. Dahl had a few things that he regretted doing with Node and wanted to build a runtime that could solve those issues. Deno, like Node, is built on the V8 ... more

How to Prepare for React Interviews – Front-End Technical Interview Guide

A front-end technical interview is an opportunity for a potential employer to assess your skills and knowledge in web development. The interviewer will ask you questions about your experience and skills in HTML, CSS, and JavaScript. They'll also likely ... more

JavaScript Random Number – How to Generate a Random Number in JS

When working with a JavaScript program, there may be times when you will need to generate a random number. For example, you may want to generate a random number when developing a JavaScript game, such as a number guessing game. JavaScript has many built-in ... more

Objects in JavaScript – A Beginner's Guide

If you declare multiple variables to hold different values, this can make your program messy and clunky. For instance, if you need to store three characteristics each for 10 individuals, having 30 variables individually declared can make your program ... more

How the JavaScript reduce and reduceRight Methods Work

reduce and reduceRight are two built-in JavaScript array methods that have a bit of a steep learning curve. But the very essence of these methods are as simple as the following arithmetic computations. Suppose we have an array of numbers: [1, 2, 3, 4] ... more

Learn Neural Networks by Building a Self-Driving Car Sim Using JavaScript

"Any application that can be written in JavaScript, will eventually be written in JavaScript." – Jeff Atwood It's time for you to create a self-driving car using JavaScript! We just published a course on the freeCodeCamp.org YouTube channel ... more

JavaScript Modules – Complete Guide to ES Modules and Module Bundlers

Modules and Module Bundlers are essential components of modern web development. But understanding how they work can quickly become overwhelming. This article will show you all you need to know about ES Modules and Module Bundlers in plain English. Table ... more

Object-Oriented Programming in JavaScript for Beginners

Hi everyone! In this article we're going to review the main characteristics of object oriented programming (OOP) with practical JavaScript examples. We will talk about OOP main concepts, why and when it can be useful, and I'll give you plenty of examples ... more

How to Learn Python in 2022

With each passing year, the Python programming language becomes more and more popular. According to the Stack Overflow Developer Survey for 2021 [https://insights.stackoverflow.com/survey/2021#technology], Python was the 3rd most popular language, following ... more

REST API Design Best Practices Handbook – How to Build a REST API with JavaScript, Node.js, and Express.js

I've created and consumed many API's over the past few years. During that time, I've come across good and bad practices and have experienced nasty situations when consuming and building API's. But there also have been great moments. There are helpful ... more

Learn How to Manipulate CSS with JavaScript by Coding a Dynamic Picture Frame

DOM manipulation can simply be defined as manipulating HTML documents (or pages) with JavaScript. The DOM stands for Document Object Model that you can visualize as a tree-like structure made up of different HTML elements. Visualizing an HTML document ... more

Learn React Router 6

React Router is a JavaScript library that helps developers create single-page applications that are responsive and have a dynamic user interface. It is a popular tool among React developers and is used to create routing and navigation for web applications. ... more

How to Destructure an Array in JavaScript

Array destructuring is an efficient way to extract multiple values from data that’s stored in an array. In this tutorial we’ll learn about array destructuring. We'll go over examples to learn the ins and outs of how array destructuring works. I've also ... more

Data Visualization with D3.js

D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS. We just published a full course on the freeCodeCamp.org YouTube channel that teaches how to implement various data visualization ... more

How to choose a JavaScript code editor

A deeper dive into the most important JavaScript Code Editors and which may be best for you. ... more