Lua Question about tables inside tables etc..

[dudeim]

Hey,

I want to know how to use tables inside tables.
Here is a script and I want to know if there is a correct way in there or I need to use another way

ExampleTable = { Example1 = { Example2 } }
-- ok so now I can have something like: ExampleTable.Example1.Example2 right?
function example()
for i = 1,100 do
    for j = 1,10 do
        ExampleTable.Example1[i].Example2[j] = i+j --this line is this possible or do I need to set it up otherwise/use table.insert first?
    end
end

function example2()
for i = 1,100 do
    for j = 1,10 do
        if ExampleTable.Example1[i].Example2[j] == nil then -- so this checks if the value exists and if it doesn't it inserts the value in the appropiate key and if it already exists then it just changes the value to the new value
           table.insert(ExampleTable.Example1[i].Example2[j],i+j)
        else
           ExampleTable.Example1[i].Example2[j] = i+j
        end
    end
end

So is the function example or example2 correct? Or do I need another way to do this?

Thanks!

 

[Cykotitan]

I usually avoid naming anything inside the subtables unless it's a config table.

Neither would work and you would end up with attempt to index field ? errors because Lua *requires* you to create the parent table before trying to call or use its child index.

ExampleTable = { Example1 = { Example2 } }
for i = 1,100 do
	[B][COLOR="red"]ExampleTable.Example1[i] = {}[/COLOR][/B]
	for j = 1,10 do
		[B][COLOR="red"]ExampleTable.Example1[i].Example2 = {}[/COLOR][/B]
		ExampleTable.Example1[i].Example2[j] = i+j --this line is this possible or do I need to set it up otherwise/use table.insert first?
	end
end

 

[dudeim]

I usually avoid naming anything inside the subtables unless it's a config table.

Neither would work and you would end up with attempt to index field ? errors because Lua *requires* you to create the parent table before trying to call or use its child index.

ExampleTable = { Example1 = { Example2 } }
for i = 1,100 do
	[B][COLOR="red"]ExampleTable.Example1[i] = {}[/COLOR][/B]
	for j = 1,10 do
		[B][COLOR="red"]ExampleTable.Example1[i].Example2 = {}[/COLOR][/B]
		ExampleTable.Example1[i].Example2[j] = i+j --this line is this possible or do I need to set it up otherwise/use table.insert first?
	end
end

ok so this line:

ExampleTable.Example1[i] = {}

basicly creates the Example2 table?

 

[Fallen]

creates unnamed table inside Example1 table

 

[dudeim]

But why would I need to create an unnamed table then? Is it so the Example2 table can exist?

 

[Cykotitan]

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Lua and Perl also take different approaches to arrays. In Perl, if you index an element beyond
the size of the array, all intermediate elements are automatically created with undefined values.
In Lua, you can index beyond the size of the array, but the intermediate elements are not
created.

 

[dudeim]

hmmm ok.
Btw Cykotitan can I pm you for help on a script I'm working on?