Mathematical and string functions

[mouakter13]

Adding mathematical expressions, date, time, and strings can be tricky. For example, a date is made up of lots of formats, slashes, and periods to complicate things. The same goes for matrices and vectors.

Use JavaScript libraries to simplify these complexities and manipulate and handle URLs effortlessly.

Examples: Date.js, Sylvester, JavaScript URL Library

User interface and its components
You can deliver a better user experience across websites by making them more responsive and dynamic, decreasing the number of DOM operations, increasing page speed, and more.

Examples: ReactJS, Glimmer.js

And those are just the most common use cases. Other uses of JavaScript libraries include:

Creating a custom dialog box
Creating keyboard shortcuts
Platform change
Creating rounded corners
Data retrieval/AJAX impact
Aligning page layouts
Creating Navigation and Routing
Logging and debugging
And many more.
Most Popular JavaScript Libraries
Below we've rounded up the most popular JavaScript libraries of the moment.

jQuery
jQuery is a classic JavaScript library that is fast, lightweight, and feature-rich. It was created in 2006 by John Resig at BarCamp NYC. jQuery is free and open source software licensed under the MIT license.

It makes things easier for HTML document manipulation and traversal, animation, event handling, and Ajax.

According to W3Techs , 77.6% of websites use jQuery (as of February 23, 2021).

jQuery Library
jQuery Library
Features/Benefits:

It has an easy-to-use and minimalist API.
Use CSS3 selectors to manipulate style properties and find elements.
jQuery is lightweight, only needs 30kb to gzip and minify, and brazil phone number data supports an AMD module.
Since its syntax is quite similar to CSS, it is easy to learn for beginners.
Expandable with plugins.
Versatility with an API that supports multiple browsers, including Chrome and Firefox.
Use cases:

Manipulating the DOM with CSS selectors that use certain criteria to select a node in the DOM. These criteria include element names and their attributes (such as class and id).
Selecting elements in the DOM using Sizzle (an open source, cross-browser selection engine).
Creating effects, events and animations.
JSON parsing.
Ajax application development.
Feature detection.
Controlling asynchronous processing with Promise and Deferred objects.