reddit - DogAPI

dog = {
    name = '',
    race = '',
    age = 0,
    nicknames = {
        ''
    }
}

function dog:new(name, race, age, nicknames)
    setmetatable({}, dog)
    self.name = name
    self.race = race
    self.age = age
    self.nicknames = nicknames
    return self
end

function dog:add_nickname(nickname)
    if type(nickname) ~= "string" then
        return false
    else
        self.nicknames[#self.nicknames + 1] = nickname
        return true
    end
end