REQUIREJS
RequireJS is a JavaScript library for downloading files and modules. It is compatible with all popular browsers - IE, Firefox, Safari, Chrome, and Opera, including quite old versions. Besides, RequireJS can be used in node.js web applications. The task of the modular script loader is to increase the speed and improve the quality of the code.
According to analytics, the average user will not wait longer than 3 seconds for a page to load. Especially if it's not the first page that is rendered. RequireJS is one of the tools to speed up page loading. Thanks to it, JavaScript is pulled up in the background, asynchronously.
If every javascript file that makes up your website or web application was loaded sequentially, it would take an incredibly long time. Also because clear dependencies between files would force the browser to process them in a clear order. Even if you don't take speed into account, such a solution is very difficult to implement and maintain its stability. RequireJS allows you to implement asynchronous loading without losing page responsiveness, as well as manage dependencies. It is much easier to write and maintain modular code. It will be cleaner and clearer, and most importantly, it will work better.
RequireJS is needed to divide javascript code into files and modules, as well as to manage dependencies between them. An additional stage of script loading allows you to load pages not only faster, but also better, more controlled. For example, the most important elements will be pulled up first.
RequireJS is a must-have front-end library for any large-scale project. Its task is to make it easier and simpler to load other JavaScript files and modules. Using RequireJS will make the code more readable and structured, and most importantly, it will speed up the loading of even heavy pages. Although this library has analogues and you can get the same result by programming the necessary dependencies manually, RequireJS is still the most popular solution that allows you to quickly get the highest quality result.