JavaScript Program to Include a JS file in Another JS file

The ability to include JavaScript files within other JavaScript files is one of the language's most significant advantages, making it an indispensable tool for front-end web development.

You can better organize your code by including JS files in another file, which will make maintenance and debugging much simpler.

Here, you'll find a detailed explanation of how to reference one JS file from within another.

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Benefits of including a JS file in Another JS file

1. By incorporating JS files in other files, it is possible to reuse code and avoid duplication across multiple files.
2. Putting JS files within another file can make your code more modular, making it easier to manage and maintain.
3. Including JS files can help you structure your code, making it easier to navigate and comprehend.

Exporting a File

Let's create a file named exporting.js ( the filename can be anything you want ) with the following content:

export { message, number, multiplyNumbers };

// JavaScript Program to include JS file into another JS file

const message = "JavaScript is the world's most popular programming language.";
const number = 1000;

function multiplyNumbers(a, b) 
    return a * b;

// exporting the variables and the functions
export { message, number, multiplyNumbers };

In order to include the variables and functions exported from the other file into another file,[ main.js ], you can use the import keyword as:

Importing the File

// import the variables and function from module.js

import { message, number, multiplyNumbers } from './exporting.js';

console.log(message); // the message...

console.log(number); // the number...

console.log(multiplyNumbers(30, 10)); // Output 300
console.log(multiplyNumbers(15, 12)); // Output 180

Conclusion

In conclusion, the ability to include a JS file within another JS file is essential for front-end web development. It enables code reuse across numerous files, making your code more modular and manageable. Depending on the demands of your project, you can use the script tag, import statement, need function to include JS files in another file.