Does RBXLua have factorials?
Hey guys,
I was in the middle of writing a code until I realised that I needed to use factorials (x!) to carry out a calculation. I noticed that the Wiki didn't help much. Does anyone know how to use factorials in Lua?
If you're unsure by what I mean with "factorial", it is a mathematical operation where x is continuously multiplied by x-1 until x=1
Example:
(4! = 4 x 3 x 2 x 1 = 24) and (5! = 5 x 4! = 5 x 24 = 120 (or 5 x 4 x 3 x 2 x 1))
2 answers
While other answer works just fine, I'm not sure why would you complicate it like that, and make it slower.
This function does exactly same, but is faster and simpler:
function fact( n )
local ret = 1
-- Simply loop through all the numbers, and multiply them together
for num=1, n do
ret = ret * num
end
return ret
end
Here is both function comparision: https://repl.it/CAUb
I don't believe Lua comes with such a function, but a quick search came up with this:
function fact (n)
if n == 0 then
return 1
else
return n * fact(n-1)
end
end
Which you can just use like so:
print(fact(5)) -- Prints '120'
Also, I have now been educated on factorials. I guess that's good?
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