Need informations about lua code.

[lotus006]

Hi, I learning Lua and some things seem weird to me.

In this code is there a ( _, ) what mean this thing.

and also if I don't insert arg into the parenthese of cmdGetNPCs wich problem can result ?

function cmdGetNPCs( ply, cmd, arg )

for _, v in pairs( ents.GetAll() ) do
if v:IsNPC() then print( "NPC found!" ) end
end

end
concommand.Add( "getnpcs", cmdGetNPCs )

Thanks in advance.

[Nev]

"_," doesn't mean anything special. An underscore( _ ) is a perfectly valid variable name. In your case, _ holds the index of v.

The three arguments( ply, cmd, arg ) are optional. However, if you don't have them and your code uses them, the code will throw an error saying they don't exist.

[lotus006]

[QUOTE=Nevec;19659911]"_," doesn't mean anything special. An underscore( _ ) is a perfectly valid variable name. In your case, _ holds the index of v.

The three arguments( ply, cmd, arg ) are optional. However, if you don't have them and your code uses them, the code will throw an error saying they don't exist.[/QUOTE]

Thanks

do you know where I can find some tutorials can explain more in deep for the variable and the arguments ?

[MegaJohnny]

[url]http://wiki.garrysmod.com/?title=Concommand.Add[/url] - the Wiki usually has a good explanation of things.

As for your variable in the loop, it's the key associated with that value as Nevec said. If I did this code:

[lua]
myTable = {}
myTable[1] = 5
myTable[2] = 12
myTable[3] = "hello"
myTable[4] = "world"

for myKey, myValue in pairs(myTable) do
print(myKey.." = "..myValue)
end
[/lua]
It would print out:
1 = 5
2 = 12
3 = hello
4 = world

[lotus006]

Thanks alot it's helped alot :)

But for in an example can you explain this one ?

[URL="http://wiki.garrysmod.com/?title=Vehicle._tostring"]__tostring[/URL]

[MegaJohnny]

Functions like that are special functions you don't call by doing vehicle.__tostring() or anything like that. In the case of the function you posted, when you have a vehicle and you put it in print (where it needs to be a string), the __tostring function will be used to let the vehicle decide what string data to return. You know how with Vectors you can just do vec1+vec2? That's achieved through the special __add function defined for vectors that lets it decide exactly what should happen when you try to add two vectors just by doing vec1+vec2.

[lotus006]

ok thanks again

I have other things about scripting

When I want to use this code it wont refresh my code in realtime.

lua_openscript autorun\client\test.lua

[Chad Mobile]

you need to do

lua_reloadents

first.

[CowThing]

[QUOTE=Chad Mobile;19676877]you need to do

lua_reloadents

first.[/QUOTE]

That's for reloading entities, not opening scripts.

[editline]01:03AM[/editline]

[QUOTE=lotus006;19673478]ok thanks again

I have other things about scripting

When I want to use this code it wont refresh my code in realtime.

lua_openscript autorun\client\test.lua

[/QUOTE]

You have to open the script every time you edit it. Having it in autorun will have it run automatically when you join a server/start the server.

[Chad Mobile]

[QUOTE=CowThing;19677705]That's for reloading entities, not opening scripts.
[/QUOTE]
He said it isn't updating, so he has to reload it.

[Nev]

lua_reloadents reloads scripted entities, not autorun scripts.

[Chad Mobile]

Whatever, I always thought using lua_reloadents will update your scripts if you made any changes.

[editline]07:36AM[/editline]

Which is what he was asking.

[*Fish*]

[QUOTE=lotus006;19673478]ok thanks again

I have other things about scripting

When I want to use this code it wont refresh my code in realtime.

lua_openscript autorun\client\test.lua

[/QUOTE]

am I only one that see's problem with that?

He is running clientside code with a command to run serverside code

he needed to use
lua_openscript_cl autorun\client\test.lua