如何在静态数组中添加创建的对象？

Question

如何在self.persons中添加所有创建的对象？

class Person
  attr_accessor :name, :last_name, :age
  def initialize(name, last_name, age = "no_age")
    @@persons = []
    @name = name
    @last_name = last_name
    @age = age
    add(@name, @last_name, @age)
  end

  def self.persons
    @@persons
  end

  private
  def add(name, last_name, age)
    @@persons << [name, last_name, age]
  end
end

person1 = Person.new("name1", "lastname1", 12)
person2 = Person.new("name2", "lastname2", 16)

p Person.persons # => [["name2", "lastname2", 16]]

Answer 1

您可以使用“条件赋值运算符”来检查数组是否为空。

def initialize(name, last_name, age = "no_age")
    @@persons ||= []
    @name = name
    @last_name = last_name
    @age = age
    add(@name, @last_name, @age)
  end