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:
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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