Re: just a little question about the lua way :)

[Asko Kauppi <askok@...>]

What really matters to me, is clearness, maintainability and generic  
"readability" of any code I write.

Sometimes, "making it Lua" may mean that you're actually making it  
harder for those PHP/C/etc. people to understand.

So, I'd be happy with:

	local result = 0

	for _,value in {1,2,3,4,5,6,7,8} do
		result = result + value
	end
	print(result)

Then again... :)

	local function sumofn( a, ... )
		if not a then
			return 0
		else
			return a + sumofn(...)
		end
	end

	print( sumofn( unpack{1,2,3,4,5,6,7,8} ) )

Note that the ... notation requires Lua 5.1, and the use of if/else  
to make sure the recursion happens with proper tail call (= not  
causing stack heating).  Hmm.. the + might in fact cause stack heat,  
would someone do the above with proper tail call then? :)

-asko


Walter Cruz kirjoitti 14.12.2005 kello 16.28:

> Hi all.
>
> I have a little doubt. I have a lua table with some values and I  
> neet the sum of them.
>
> Here's is the code snippet:
> _________
> c = 0
> function sum(v)
> c = c+v
> print(c)
> end
>
> values ={1,2,3,4,5,6,7,8}
>
> result = 0
> for _,value in values do
> result = result + value
> end
> print(result)
>
>
> table.foreach(values,sum)
> _________
>
> The code between result = 0 and print(result) works, but i don't  
> think that this is the 'lua way' of doing the things. Except by the  
> lua way of make the for loop, this could be C, PHP or javascript.
>
> The function sum is my attempt to make it more 'lua'. It works, but  
> all the values are printed and I have the c variable outside of the  
> scope of the function (global). As far I know, I can do it with a  
> closure no ?
>
> I just wanna make my lua code more lua :)
>
> Thanks on advance.
>
> []'s
> - Walter