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First :-

I wanna know, what is the best way to save table in element data ? i know 2 ways only but if there are more and better than those, i hope you tell me

--1st way >> table {}
setElementData(player,"data",{x,y,z})

--2nd way >> toJSON
setElementData(player,"data",toJSON(x,y,z))

Second :-

What's the best way to extract variables from table. I know 3 ways but i don't know which one is the best 

--1st way >> unpack()
setElementData(player,"data",{x,y,z})
local data = getElementData(player,"data")
local x,y,z = unpack(data)

--2nd way >> data[i]
setElementData(player,"data",{x,y,z})
local data = getElementData(player,"data")
local x,y,z = data[1],data[2],data[3]

--3rd way >> fromJSON
setElementData(player,"data",toJSON(x,y,z))
local data = fromJSON(getElementData(player,"data"))
--then i use the 3rd line of either of the last 2 ways

Thanks in advance

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Third :-

if there is a function which was attached to event and you call it a lot in the same and other side (client or server) ,would it be better if we just call the function in the same side by its name or using this :-

triggerEvent("function-name")

 

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The sort answer:

--1st way >> table {}
setElementData(player,"data",{x,y,z})

and

--2nd way >> data[i]
setElementData(player,"data",{x,y,z})
local data = getElementData(player,"data")
local x,y,z = data[1],data[2],data[3]

 

You can test all of them easily for yourself:

-- CLIENT

local startTick = getTickCount()

for i = 1, 100000 do
    -- execute the code 100000 times
  
    setElementData(localPlayer,"data",{0,0,0})
    local data  = getElementData(localPlayer,"data")
    local x,y,z = data[1],data[2],data[3]
end

local endTick = getTickCount()
print("Execution time:", endTick - startTick .. " ms")

 

And you should check this:

 

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