Teal OOP example

local record Class
   __name:string
   __init:function(self:Class, ...:any)
end

function setup_as_class(class:Class, name:string):any
  class.__name = name
  setmetatable(
     class, { 
       __call = function(_, ...):any
         local instance = setmetatable({ __class = class }, { __index = class })
         if class.__init ~= nil then
           class.__init(instance, ...)
         end
         return instance
       end,
     }
  )
end

----------------------

local record Foo
   _bar:string
   metamethod __call: function(self: Foo, bar:string): Foo
end

function Foo:__init(bar:string)
   self._bar = bar or "asdf"
end

function Foo:get_bar():string
   return self._bar
end

setup_as_class(Foo, "Foo")

----------------------

local foo1 = Foo()
print(foo1:get_bar())

local foo2 = Foo("zxcv")
print(foo2:get_bar())