pcall with variable argument in lua

Question

I am looking for a way to pcall a function which has variable arguments in lua5.3.

I am hoping for something like this

function add(...)
local sum=arg + ...
return sum
end

stat,err=pcall(add,...)

thanks

Answer 1

function add(...)
   local sum = 0
   for _, v in ipairs{...} do 
      sum = sum + v
   end
   return sum
end

pcall(add, 1, 2, 3)
-->   true    6

or maybe this is closer to what you wanted:

function add(acc, ...)
   if not ... then
      return acc
   else 
      return add(acc + ..., select(2, ...))
   end
end

pcall(add, 1, 2, 3)
-->   true    6