Lua decimal sign?

Question

I've used this in other languages, but lua seems to be lacking this rather useful function.

Could one of you nice chappies provide me a lua function to get the sign of the number passed to it?

Answer 1

function math.sign(x)
   if x<0 then
     return -1
   elseif x>0 then
     return 1
   else
     return 0
   end
end