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
