What does this mean?

Help and Feedback Scripting Support
#1

i was in a youtube video and i have a question…

What Does Mean " _G"
?

And someone can explain what is coroutine?

1 Like
#2

_G Its Global Variable can use it in every script but local in one script
script 1

_G.Hello = "Hi"

script 2

print(_G.Hello)

a coroutine is used to perform multiple tasks at the same time
so you can use 2 while do in one script and all of them work like in this script

local test = coroutine.create(function()
      while wait(1) do
         print("Hi")
      end
end

coroutine.resume(test)

 while wait(1) do
    print("Test 2")
 end

coroutine: coroutine

#3

So on multiplayer games there is this “client server model” where there are clients (aka your computer and other people’s computers that are playing the game) and then there is a single server (at least for Roblox). The server acts as this mediator that handles save data and other things.

_G is a device-sided table. In other words, on a Script in roblox it would be the same for all the Scripts.
On a LocalScript though it would be the same for the same client but not replicated to other clients.
Basically it’s a universal table that is not replicated across devices. It can be accessed from scripts running from the same device.

Script1:

_G.H = "Hello world"

Script2:

repeat wait() until _G.H
print(_G.H)
#4

Crude answer for coroutine is that it runs an independent thread. All Scripts and LocalScripts are ran on their own thread I believe. So it starts another thread without it being in a different script.

#5
#6

_G represents the global environment, it’s a table value where global variables are held. Roblox has its own global variable named “shared” which shares the same behavior as Lua’s _G. Which you ultimately use is entirely optional.

“G_”'s definition in relation to Roblox can be found here:
https://developer.roblox.com/en-us/api-reference/lua-docs/Lua-Globals

“shared”'s definition can be found here:
https://developer.roblox.com/en-us/api-reference/lua-docs/Roblox-Globals