> For the complete documentation index, see [llms.txt](https://javascriptuse.gitbook.io/javascript/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://javascriptuse.gitbook.io/javascript/advanced/javascript-chuyen-sau-tu-ham-iife-toi-module-pattern/iife-greater-than-immediately-invoked-function-expression-greater-than-khoi-tao-function-and-chay-ng.md). # IIFE=>Immediately Invoked Function Expression=>khởi tạo function & chạy ngay, import, export như nào index.html ```html

JavaScript Modules

``` file1.js ```javascript export const greet = (name) => { return `Hello, ${name}!`; }; ``` file2.js ```javascript import { greet } from './file1.js'; const aa = (function () { const message1 = greet('John 2'); return { message1 } })(); export default aa; ``` file3.js ```javascript import { greet } from './file1.js'; import aa from "./file2.js"; const bb = (function () { const message2 = greet('John 3') + aa.message1; return { message2 } })(); export default bb; ``` app.js ```javascript import bb from "./file3.js"; console.log(bb.message2) ```