No restricted globals

No Restricted Globals

When working with JavaScript, it is important to avoid using global variables as much as possible. Global variables can lead to naming conflicts, make code harder to read and maintain, and can cause unexpected behavior.

Fortunately, there are several ways to avoid using restricted globals in JavaScript. Let’s explore some of the solutions:

1. Using Modules

One of the best ways to avoid restricted globals is by using modules. Modules allow you to encapsulate your code and only expose the necessary variables and functions to the outside world. This helps in preventing naming conflicts and provides a clean and organized structure to your code.

Here’s an example of how you can create a module:

/* module.js */
const myModule = (function() {
  let privateVariable = 'I am private';

  function privateFunction() {
    console.log('This is a private function');
  }

  function publicFunction() {
    console.log('This is a public function');
  }

  return {
    publicFunction
  };
})();

myModule.publicFunction(); // Output: This is a public function
myModule.privateVariable; // Output: undefined
myModule.privateFunction(); // Output: TypeError: myModule.privateFunction is not a function

In the above example, the privateVariable and privateFunction are not accessible outside the module, while the publicFunction is exposed and can be accessed.

2. Using Immediately Invoked Function Expressions (IIFE)

Another way to avoid restricted globals is by using Immediately Invoked Function Expressions (IIFE). An IIFE is a function that is immediately executed after it is defined. This helps in creating a private scope for your variables and functions.

Here’s an example of how you can use an IIFE:

(function() {
  let privateVariable = 'I am private';

  function privateFunction() {
    console.log('This is a private function');
  }

  function publicFunction() {
    console.log('This is a public function');
  }

  publicFunction(); // Output: This is a public function
  privateVariable; // Output: undefined
  privateFunction(); // Output: TypeError: privateFunction is not a function
})();

In the above example, the privateVariable and privateFunction are not accessible outside the IIFE, while the publicFunction is accessible within the IIFE.

3. Using ES6 Modules

If you are working with modern browsers or using a build tool like Webpack or Babel, you can take advantage of ES6 modules. ES6 modules provide a standardized way to define and import/export modules in JavaScript.

Here’s an example of how you can use ES6 modules:

// module.js
let privateVariable = 'I am private';

function privateFunction() {
  console.log('This is a private function');
}

export function publicFunction() {
  console.log('This is a public function');
}

// main.js
import { publicFunction } from './module.js';

publicFunction(); // Output: This is a public function
privateVariable; // Output: undefined
privateFunction(); // Output: TypeError: privateFunction is not a function

In the above example, the privateVariable and privateFunction are not accessible outside the module, while the publicFunction is exported and can be imported and used in other modules.

By following these approaches, you can avoid using restricted globals in your JavaScript code, leading to cleaner, more maintainable, and less error-prone code.

Remember, it’s always a good practice to minimize the use of global variables and keep your code modular and organized.

No restricted globals