objects_in_lua.lua

-- Table based object with method

function newPerson(name)
  local M = {
    name = name,
    age = 0,
  }
 
  M.greet = function (self)
    print ("This is " .. self.name .. ", I am " .. self.age)
  end
  
  M.age = math.random(100)
  
  return M
end


local p1 = newPerson("Adam")
p1.age = 6
p1:greet()


-- ------------------------------------------------------------------
-- Closure based object with method

function Persona(name)
  local self = {}
  
  self.name = name
  self.age = math.random(100)
  
  function self.greet() 
    print ("This is " .. self.name .. ", I am " .. self.age)
  end
  
  return self
end


local p2 = Persona("Beth")
local p3 = Persona("Charlie")

p2.age = 12

-- Here we don't have to call using ':' as "self" is already stored in the methods.
p2.greet()
p3.greet()