While I may not be an expert in JavaScript, I find it intriguing that within a project containing 3 JavaScript files, any of these files can access functions from the others. The real puzzle lies in figuring out how to prevent this from happening. For instance, let's consider three hypothetical JavaScript files named ManagerJS.js, TeamAJS.js, and TeamBJS.js. How can we restrict TeamAJS from accessing TeamBJS while still allowing both to access ManagerJS?
When it comes to scripts on a page, they are all evaluated within the global scope which is shared by every script on that page.
To restrict access to certain variables or functions, one option is to avoid defining them in the global scope. Instead, you can use an Immediately Invoked Function Expression (IIFE) to create a private scope for each individual script:
// myScript.js
(function() {
// any declarations made here are only accessible within this function's scope
var localValue = 42;
// if necessary, values can be exposed as global variables explicitly
window.globalValue = 21;
}());
Only expose values that should be accessed by other parts of code or scripts. The revealing module pattern is just one way to achieve this.
For more insights, check out discussions on the purpose of a self-executing function in JavaScripthere.
If you're looking to implement a dependency injection system, there are several options available in the market. Some popular choices include CommonJS, RequireJS, ES6 imports, and many others that cater to different needs.
Let's take a look at an example using CommonJS:
// Inside TeamAJS.js...
// Import the Manager script
var Manager = require('./ManagerJS')
// Utilize functionality from Manager
// Please note: You need to require TeamBJS as a dependency to access it
module.exports = {
// Include any methods or variables here that you want to make accessible to other modules
}
You can find helpful resources on module implementation on the RequireJS website.
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