Lua Quick Start Guide

Single inheritance

When using single inheritance, any class can inherit functionality from only one super class. To implement single inheritance, create a new class through an existing constructor. This can be a bit confusing, so let's see an example.

Start by creating an Animal class; this will be the base class:

Animal = {  sound = ""}Animal.new = function(self, object)    object = object or {}    setmetatable(object, self)    self.__index = self    return objectendAnimal.MakeSound = function(self)    print(self.sound)end

Not every animal is going to make the same sound. Create two new classes, dog and cat, that extend Animal:

-- Dog is a class, not an object (instance)Dog = Animal:new()Dog.sound = "woof"-- Cat is a class, not an Object (instance)Cat = ...