I literally only just found out that _G variables are a thing. But there is one concern, how secure are _G variables and what are the pros and cons?
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Security with _G variables?
2 answers
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Hey.
Your answer put shortly; nothing is secure on the client whatsoever. Any value on the client can be spoofed in any way shape or form that an exploiter would like. This does include _G as exploiters can access the roblox environment. Exploiters can also go as far as to even modify local variables in your scripts, modify function upvalues, etc...
Accessing your _G is pretty much as simple as getrenv()._G and we're done.
Hope this helped! If it did, please make sure to upvote and accept the answer. :)
In short, _G variables share the same execution context level over all scripts. For example,you can do something like this:
LocalScript
_G.hi = "Hi"
print(_G.hi)
Output: "Hi"
But, if you set the _G variable on the server, the client will not be able to access those variables.
To sum things up, on the server _G is fairly secure because only server scripts can access/change them. However on the client, _G is not secure, as anyone running an exploit can quite easily modify the variables you're using.
Moving onto pros and cons. As for some basic pros you could say:
Variable shared across all scripts of the same context level
Easy way to give other scripts access to things like functions, tables and variables
And quite a simple con is:
Not secure on the client whatsoever.
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