Simple Lua Class

personClass.lua

#!./bin/lua

Person = {} do
    setmetatable(Person, { __index = string }) -- Optional. Inheritance

    local personMessage;

    function Person.new(name, age)
        local self = setmetatable({}, { __index = Person })

        self.name = name
        self.age = age

        return self
    end

    function Person.staticMethod()
        print("This is a static method")
    end

    function Person:increaseAge()
        self.age = self.age + 1
    end

    function Person:sayHappyBirthday()
        personMessage = self.name .. " have " .. self.age .. " years old. Happy Birthday!"
        self:increaseAge()

        return personMessage
    end
end

local henrique = Person.new("Henrique Gogó", 29)
local daiane = Person.new("Daiane", 31)

print("About " .. henrique.name)
print(henrique:sayHappyBirthday())
print("About " .. daiane.name)
print(daiane:sayHappyBirthday())

print("Now " .. henrique:sayHappyBirthday())
print("Now " .. daiane:sayHappyBirthday())

Person.staticMethod()
henrique.staticMethod()

print(henrique.lower("This CLASS use the 'STRING' as Inheritance"))