function curry2(f)
   return function(a)
      return function(b)
         return f(a,b)
      end
   end
end

function add(a,b)
   return a + b
end

local curryAdd = curry2(add)
local add2 = curryAdd(2)

print(add2(3))
print(add2(4))
print(curryAdd(4)(2))

5
6
6