JavaScript Modules

JavaScript Modules

JavaScript Modules

In JavaScript, modules are a way to organize and encapsulate code in separate files. Modules were introduced in ECMAScript 6 (ES6) and provide a standardized way to share code between different parts of an application or between different applications.

Here’s an example of a simple module that exports a function:

				
					// math.js
export function add(x, y) {
  return x + y;
}

				
			

This module exports a function add that takes two arguments and returns their sum. To use this function in another part of the application, you can import it:

				
					// app.js
import { add } from './math.js';

const result = add(2, 3);
console.log(result); // logs 5

				
			

This code imports the add function from the math.js module using the import statement. The imported function can then be used in the app.js module.

Modules provide several benefits:

  1. Encapsulation: Modules allow you to encapsulate code and data in separate files, making it easier to manage and organize code.
  2. Reusability: Modules can be reused across different parts of an application or between different applications, making it easier to share code and reduce duplication.
  3. Modularity: Modules promote modularity, allowing you to break up large codebases into smaller, more manageable parts.
  4. Dependency management: Modules allow you to manage dependencies between different parts of an application or between different applications, making it easier to ensure that all required code and libraries are available.

JavaScript modules can be either named or default. Named exports allow you to export multiple values from a module, while default exports allow you to export a single value from a module. Modules can also have dependencies on other modules, which are managed using a module loader such as Node.js or a bundler such as Webpack.

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