Simple example of a combination class definition / construction function in Lua.

class_test.lua

function Class (arg1, arg2, arg3)
    local obj = {}
        obj.var1 = arg1
        obj.var2 = arg2
        obj.var3 = arg3
        
        function obj:out (arg)
            print(self[arg])
        end
    
    return obj
end

test = Class("One", "Two", "Three")

test:out("var1")
print(test.var1)