Table data types

[qqqbbb]

Why does this code not print anything?

	for PromotionsRow in GameInfo.UnitPromotions() do
		for k,v in pairs(PromotionsRow) do
			if type(v) == number and v > 0 then
				print(PromotionsRow.Type,k) 
			end
		end
	end

 

[LeeS]

The lua demo page will help to a certain degree:

local iTest = 1
if type(iTest) == number then
   print("iTest is a number")
end

results in an empy 'output screen'.

local iTest = 1
if type(iTest) == "number" then
   print("iTest is a number")
end

results in an 'output screen' of

iTest is a number

Your basic problem is that you are testing against a variable called number which has never been initialized and therefore is 'nil'. 'v' in your code-construct will never be evaluated as both 'nil' and greater than '0'.

The type(X) function in lua gives a string value, and therefore all evaluations against it must be stated as string values. (ie, "number" instead of number)

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You could initialize variable number, as in

local number = "number"

but that wouldn't be any easier than just using "number" as the value to evaluate against in your code.

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Also, not sure why you are trying to iterate through each and every column in each and every row in the UnitPromotions table. There may be a more efficient way of doing whatever it is you really want to accomplish.

 

[qqqbbb]

Thanks

Also, not sure why you are trying to iterate through each and every column in each and every row in the UnitPromotions table. There may be a more efficient way of doing whatever it is you really want to accomplish.

I just want to know which promotion uses which column.

 

[whoward69]

Scratch that! I a) mistyped it and b) was considering custom database tables where the default values are not 0/false ... which is not something that corners the core database tables greatly