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Array Names

11 replies

Array Names

Blighted Song
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29.06.11 03:40:07 am

There is probably a really easy answer to this I just can't find anything about it, so.

All I want to do is make an array for each user however concentraiting doesnt work for me

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i=0
while i<33
	i=i+1
	"array"..i=initArray()
end

returns '=' expected near '..'
same results useing the 'id' variable.

And apparently lua doesnt like strings as variable names. . .

So as I said probably something I overlooked but help is appriciated. Thanks.

Re: Array Names

Starkkz
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29.06.11 03:49:18 am

try this:

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function initArray(size,value)
	local a = {}
	for i = 1, size do
		a[i] = value
	end
	return a
end

array = initArray(32,0)

The index is 0, and the arrays doesn't have a length limit.

Re: Array Names

Blighted Song
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29.06.11 03:51:33 am

That isnt my problem, my problem is with the name of the array, not its content.

Re: Array Names

Starkkz
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29.06.11 03:53:08 am

You can get the name / id of the array using tostring function. Try doing this:

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array = {}
print(tostring(array))

That will print you on the console the array name

Re: Array Names

Blighted Song
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29.06.11 03:56:32 am

You don't understand, its not the manipulation that is the problem, I want to have the name of the array as a string.

So the name of the array would be array1 for "array"..id, however lua dosnt like me useing a string as the name for the array.

All I want to know is if there is a way to do just that.

Re: Array Names

Starkkz
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29.06.11 04:01:03 am

Ahh, you mean when you write in the Lua script for example:

MyArray = {}

You wanna have that array as a string?. I think it's not possible, but if you have the string and you want to get the array you can get it by the global array.

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MyArray = {}
print(type(_G["MyArray"]))

The global array is _G.

The other thing that can load strings is to convert them. You can use loadstring(the script).

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-- Our string function
myScript = [[
	function (id)
		msg(player(id,"name"))
	end
]]
printName = loadstring(myScript) -- Load the string function
printName(1) -- Execute the function

Re: Array Names

Blighted Song
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29.06.11 04:05:44 am

No, thats not right, I dont want the array as a string.

I want a string as the name of the array, but lua won't exept a string.

So the non working example is "array"..id, which returns array1 (player 1), and I want to use that string ("array1") as the array name.

Re: Array Names

Starkkz
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29.06.11 04:20:07 am

array1 doesn't seem to be array.
array[1] should be right. Theres no way to get it as a string.

Re: Array Names

archmage
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29.06.11 04:38:23 am

I do not know why you would want to do this, but you can do it like so:

It only works with global tables and you use it like:

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t = {1, 2, 3, 5, 8}
array_to_string(t)
-- now t1, t2, t3, t4, t5 exist

print(t1, t2, t3, t4, t5)
-- prints: 1, 2, 3, 5, 8

edit:
to create a variable from a string just use

loadstring("varname = "..value)()

Re: Array Names

Blighted Song
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29.06.11 04:45:57 am

Edit:

Finally, ^ ^ ^ thats all I wanted, thanks for the help.

Re: Array Names

Lee
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29.06.11 05:33:33 am

@Dark Byte:

It's a (marginally) better practice to use _G["name"] = val to set values within the global namespace. Neither is usually recommended unless you're knowingly manipulating the language and understand what it is you're doing.

IE:

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function create_n(n, name)
	name = name or "array"
	for i=1,n do
		_G[name..i] = {}
	end
end

The fact that your global namespace is a table also lends to some interesting use cases with metatables.

Re: Array Names

Starkkz
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29.06.11 01:12:24 pm

archmage has written

I do not know why you would want to do this, but you can do it like so:

It only works with global tables and you use it like:

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t = {1, 2, 3, 5, 8}
array_to_string(t)
-- now t1, t2, t3, t4, t5 exist

print(t1, t2, t3, t4, t5)
-- prints: 1, 2, 3, 5, 8

edit:
to create a variable from a string just use

loadstring("varname = "..value)()

I didn't do that because if you have a similar table it can be confused with other.