Lua Object as a Function- https://repl.it/Hx2o/8

Hx2o-8.lua

-- Lua object implemented with just functions.

function make(a,b)
  return function(msg)
    if msg == "a" then return a end
    if msg == "b" then return b end
    if msg == "mul" then 
      return function()
        return a * b
      end
    end
    if msg == "tostring" then
      return function (str)
        return string.format(str,a,b)
      end
    end
  end
end

x = make(5,6)
y = make(42,3.14)
print(x("a"))
print(x("b"))
print(y("a"))
print(x("mul")())
print(y("tostring")("<%d,%d>"))