class

Animal = { name = "", age = 0 }

function Animal:new (o) 
  o = o or {}
  setmetatable(o, self)
  self.__index = self
  return o
end

function Animal:bark () 
  print(self.name .. ': waor')
end


misha = Animal:new({ name = 'Misha', age = 12 })

misha:bark()

-- string: 'Misha: waor'

ps: 如果要使用self 关键字。new方法必须使用 : 声明。并且调用的时候也要记得用 :

extends

Cat = Animal:new()

function Pet:bark ()
  print(self.name .. ': miao')
end

cat = Cat:new {name = 'as', age = 6 }

cat:bark()

VS Code snippet

"new class": {
    "prefix": "newclass",
    "body": [
      "$1 = { $2 }",
      "",
      "function $1:new (o)",
      "  o = o or {}",
      "  setmetatable(o, self)",
      "  self.__index = self",
      "  return o",
      "end",
      "",
      "$3"
  ]
}