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…
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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…
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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…
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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…
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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…
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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…
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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…
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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…
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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….
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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…
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A Closer Look at jQuery Selectors

Selectors are the foundation of the jQuery library. They will always be used when using jQuery to manipulate the DOM. Selectors operate as a function to return a matching…
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What is JSON?

JSON is an acronym for JavaScript Object Notation. It is a JavaScript object that organizes data in key/value pairs. Storing data in this manner makes these objects lightweight…
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JavaScript: Go to URL: A Complete Guide

The window.location value represents the current URL you are viewing in your browser. You can replace this value to go to another URL In JavaScript. This is useful if you…
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JavaScript JSON: A Guide

JSON, short for JavaScript Object Notation, is a way of storing data. In JSON objects, values are mapped to labels called keys. JSON objects can store any data type, including…
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JavaScript: Object.values(): A Complete Guide

The JavaScript Object.values() method retrieves a list of the values in an object. You can iterate over the result of the values() method to see the contents of each value…
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JavaScript Ternary Operators: A Step-By-Step Guide

The JavaScript ternary operator evaluates a statement and returns one of two values. A ternary operator can be instructed to return a value if the statement evaluates to either…
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JavaScript Modulo: A How-To Guide

The JavaScript modulo operator returns the remainder of a division sum. To calculate the remainder of a division sum, use the percentage sign (%). The syntax for the modulo…
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An Introduction to Strings in JavaScript

A string in JavaScript, as is the case in many other programming languages, is a data type that holds data in text form. A common use for strings in the context of a web application…
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Manage State in React with setState

Keeping track of an application’s state is how a single page application (SAP) registers changes and renders them to the user. Unlike a model, view, controller (MVC) framework,…
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A Beginner’s Guide to jQuery on()

The jQuery on() method is a way to attach an event handler on an element. The element passed to the selector can be anything on the page. Most commonly, on() is a way to attach…
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