# JS Modules

- JS modules helps us in organizing the our scripts and writing multi file code .

## What is a module?
A module is just a file. One script is one module. As simple as that.

- Modules can load each other and use special directives export and import to interchange functionality, call functions of one module from another one:

- **export** keyword labels variables and functions that should be accessible from outside the current module.
-** import** allows the import of functionality from other modules.

> Note : All code that is not exported in a module will be executed only once and further it's imports will shared with other files. 

> There’s a rule: top-level module code should be used for initialization, creation of module-specific internal data structures. If we need to make something callable multiple times – we should export it as a function, like we did with sayHi above.

 [Source & More readings](https://javascript.info/modules-intro)