local VS global in lua

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every source agrees in that point:

the access to local variables is faster than to global ones

In practical use, the main difference is how to handle the variable, due it's limited to the scope and not accessable from any point of the code.

In theory, a local variable is save from illegal alteration due it's not accessable from a wrong point and, even bette, to lookup the var is much more performant.

Now I wonder about the details of that concept; How does it technically work, that some parts of the code can access, others can not? How improoved is the Performance?

But the main question is: Let's mention I got a var bazinga = "So cool." and want to change it from somewhere. Due the string is public, I can do this easy. But now, if it's declared local and I'm out of scope, what performance effort is made, to gain access, if I handover the variable through X functions like this:

func_3(bazinga)
    func_N(bazinga)
end
func_2(bazinga)
   func_3(bazinga)
end

func_1()
  local bazinga = "So cool."
  func_2(bazinga) 
end

Up too wich point, the local variable keeps beeing more performant and why?

I ask you, due maintaining code in which objects are handed over many functions are getting a mess and I want to know, if it's really worth it.

asked 42 secs ago

Sempie

137

local VS global in lua