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JavaScript Tutorials

JavaScript Add Class: A Guide

Adding a class property to an element helps the developer create a dynamic user experience on the web page. When a class property is added to an element, that selected element will assume the styling associated with that class name.…

Using jQuery toggle()

The jQuery toggle() method can be thought of as a lightswitch. When called, it toggles the selected elements “on” or “off.” That is, it toggles between rendering elements to the user or hiding them. In the following example, we will…

npm err! missing script: start Solution

If you have worked on JavaScript applications, you have seen and probably used Node.js. There are lots of tools in Node.js, and npm (node package manager) can help you manage them. npm installs the packages you want and provides a…

Getting Started with npm uninstall

With any well designed software, there must be a way to not only install the software, but to uninstall it from your machine. Node Package Manager, or npm, offers a simple command to achieve this. Using the npm uninstall command…

npm command not found

Npm (node package manager) helps JavaScript developers focus on the code instead of other — sometimes tedious and repetitive — details. Sometimes, however, you may come across npm errors such as npm command not found. We will work through how…

What is npm init?

The npm init command in the JSON language creates a package.json file for your project’s frontend. A package.json file is a file that contains information about the project’s packages and dependencies. It also contains metadata for the project such as…

JavaScript Try Catch: A Step-By-Step Guide

JavaScript try catch blocks are error handlers. The “try” block contains the code you want to test. “catch” contains code that will run if the code in your “try” block cannot execute successfully. When developers are testing their programs, it’s…

JavaScript Array Length: A Complete Guide

The JavaScript array length property states the number of items in an array. To find the length of an array, reference the object array_name.length. The length property returns an integer. You’ll often want to know how many values are in…

How to Use React useEffect

The development team at React introduced the concept of Hooks in React version 16.8. A React Hook allows the use of state and other React features in a function component. With the hook useState, a function component can set its…

React Lifecycle: An Overview

A lifecycle in React can be thought of in three different phases: mounting, updating, and unmounting. Mounting occurs when the React component renders to the DOM (Document Object Model). When changes are made to that component, it enters the updating…

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