What is Require Js and How does it work?

RequireJS is a basic JavaScript file loader used to load scripts efficiently. It also acts as a framework to manage dependencies between JavaScript files.

In modular programming, functionality is divided into different modules. RequireJS helps assemble these modules, improving code speed, structure, and overall quality.

In this blog, we’ll explore “What is RequireJS and How to Use It?” and understand how this JavaScript file and module loader helps manage dependencies efficiently.

Why Require JS

There are some reasons:

 • In a large application a lot of JavaScript files are needed, and each script tag needs a request.
 • You have to put them in a same order in which they are called, i.e. File which is dependent on other should be loaded after the dependent ones.

How to use

You can Downalod the file.

Take an example path of your JavaScript files:

|-scripts
	|--main.js
	|--require.js
	|--example.js

Now you just need to add a <script> tag in your html file to include Require.js file.

<script data-main="scripts/main" src="scripts/require.js"></script>

You can place this script tag at the head or at the bottom of the phtml file.

Here main.js is the main JavaScript file of my application.

In above <script> tag by the data-main attribute require.js will start initialization of files.(path of the folder/file name).
data-main is uses when you have only single entry point, if you have multiple entry points then you can include it by html also.

Now in main.js we have following code:

requirejs([
   "example"
], function(example) {
   //you code stuff is here
   //example.callFunction();
});

In RequireJS all the code is written under requirejs() or define() functions.

Here, It searched “example.js” in the same folder and take example as an object of the example.js file to call the functions of the example.js.

You can also include files from different folder’s.

Advantages of RequireJs

• Lazy loading
• Reduce code Complexity in large application
• Assembly of different splited file at compile time
• Less HTTP requests
• No need to define them in some proper order
  

I hope this blog will help you with Require Js and its work.

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Try this and if you have any queries then just comment below 🙂