questions about variables in LUA.

Search ain't my best friend tho it says 0 results on this question.

But how can I use a variable in a variable?

because i see in some scripts like

variable.[someothervariable]

somehow it doesn't want to work with me


Code:

if not PartyscanDBPC.DB.[scantypexxz] then

results in a massive exploding of error messages:


Quote:




Date: 2008-04-28 16:41:06

ID: 51

Error occured in: Global

Count: 1

Message: ..\AddOns\Partyscan\Partyscan.lua line 193:

'<name>' expected near '['

Debug:

[C]: ?

AddOns:

Gatherer, v3.1.1

Ace2

Partyscan, v1.0

Swatter, v5.0.PRE.2966




because of this the script wont work at all.

Seems like it won't work

I need the variable from scantypexxz at PartyscanDBPC.DB.

so it would turn to PartyscanDBPC.DB.somevalue

It is for me mainly to shorten some procedures like


Code:

If ( scantypexxz == "Players" ) then 
-- code regarding value players
elseif ( scantypexxz == "Members" )  then
-- code regarding value members
end

and lateron i wanted to use like PartyscanDBPC.DB.[scantypexxz].[uniqueID]

anyone knows whats going wrong?

Because if i look to the other scripts, it should work.

but he's now complaining about the '['|||The period separator and [] are two different ways of indexing a table variable in Lua -- you don't use them together like that. First, you'd need to have a table variable. For example:

DB = {}

DB.a = 1

DB.b = 2

You now have a table named DB. It has two entries, "a", and "b", each of which has a value assigned to it. You can refer to those entries in multiple ways:

DB.a

DB["a"]

which = "a"; DB[which]

That's why it's complaining about the code you have:

DB.[which]

is not legal syntax.|||You can also do:


Code:

local scantypexxz = PartyscanDBPC.DB.scantypexxz;
If ( scantypexxz == "Players" ) then 
-- code regarding value players
elseif ( scantypexxz == "Members" )  then
-- code regarding value members
end

and also


Code:

local scantypexxz = PartyscanDBPC.DB.scantypexxz;
If ( scantypexxz.uniqueID == 1 ) then 
-- code regarding value 1
elseif ( scantypexxz.uniqueID == 2 )  then
-- code regarding value 2
end

or even


Code:

local uniqueID = PartyscanDBPC.DB.scantypexxz.uniqueID;
If ( uniqueID == 1 ) then 
-- code regarding value 1
elseif ( uniqueID == 2 )  then
-- code regarding value 2
end

Be sure, though, that when you are trying to access parts of a table ... that the value is a table. So:


Code:

myTable = {}; -- creates a table
myTable.a = 1;  -- populates data
myTable.b = 2;  -- populates data
myTable.subTable = {}; -- creates anothe table INSIDE this table
myTable.invalidTable = 3; -- populates data
x = myTable; -- This is okay!
x = myTable.a -- This is okay!
x = myTable.subTable; -- This is okay!
x = myTable.subTable.a; -- This is okay! Although it will be nil
x = myTable.invalidTable; -- This is okay!
x = myTable.invalidTable.a; -- ERROR! "invalidTable" is not a table, therefore it doesn't have table entries, so "a" is invalid.

|||Quote:








The period separator and [] are two different ways of indexing a table variable in Lua -- you don't use them together like that. First, you'd need to have a table variable. For example:

DB = {}

DB.a = 1

DB.b = 2

You now have a table named DB. It has two entries, "a", and "b", each of which has a value assigned to it. You can refer to those entries in multiple ways:

DB.a

DB["a"]

which = "a"; DB[which]

That's why it's complaining about the code you have:

DB.[which]

is not legal syntax.




Thank you. it is working now, toobad it need to have a "prefix" before it works.

But it will be alright, it will still be the same :)

thanks again|||I can't edit my postmsg but ok.

I've readed wrong but now i got it (i was just awake when i readed) :P

if i do

some[value]

it referes to

some.("returns the value of value")

now i got it

Thanks!