JavaScript security: access objects within (function(){})-CodePudding

Even though, I am not a JS newbie, I still have never used (function() {}) before as there was no need. But now I am concerned with security on userside level for my JS game to avoid cheating. So what I did is I placed the following code in my js file:

(function() {
    'use strict';
    
    let a = 1;
});

I tried to access the a variable from console and I couldn't. So I wanted to know - will users be able to access those variables and change them if I use this kind of structure?

CodePudding user response：

There is nothing you can to do completely secure that variable. Users will still be able to access it using the debugger, local overrides, or probably other means as well.

A value like that which you need to be immutable to a skilled browser user needs to be stored on a secured backend (server, api, or something).

For example see: Is there a way to change variable values while debugging JavaScript?