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Syntax: define() ⁢to ⁤define modules and asynchronous loading. Use Cases: ⁢Widely⁣ used in browser-based ⁤applications, especially before ES modules became ⁣prevalent.
Example:

javascript
    // moduleA.js
    define(function() {
      return function() {
        console.log("Hello from Module A!");
      };
    });

    // moduleB.js
    define(['./moduleA'], function(moduleA) {
      moduleA();
    });
    

3. Worldwide Module Definition (UMD)

UMD aims to be compatible ​with both CommonJS ‍and AMD,providing⁣ a single⁢ module⁢ format that ⁢works in various‌ environments. ‌It attempts to⁢ detect​ the module system and adapt accordingly.

Syntax: A wrapper function that checks for different module environments.
Use Cases: Useful for creating libraries ⁣that need to‍ work in both Node.js and the browser.
Complexity: Can ⁤be⁤ more complex to write ⁢than CJS ‌or​ AMD directly.

Syntax: import to import modules and export to export.
Use Cases: increasingly becoming‍ the ​standard for‍ modern JavaScript development, supported natively in browsers ⁣and Node.js.
Example:
⁢ ⁣ ```javascript
// moduleA.js
export function sayHello() ⁢{
⁣ console.log("Hello from Module A!");
⁣ }

‌ // moduleB.js
‌ import {⁢ sayHello } from './moduleA.