Question

对于每行代码，都会给出一个描述。我已经完成了一半的程序并且停留在self对象和转发程序中，所以请完成它以使其正常工作。

 class Person
  #have a first_name and last_name attribute with public accessors
  #attr_accessor 

  attr_accessor :first_name , :last_name

  #have a class attribute called `people` that holds an array of objects

  @@people = []

  #have an `initialize` method to initialize each instance
  def initialize(first_name,last_name)#should take 2 parameters for first_name and last_name
    @first_name = first_name
    @last_name = last_name      #assign those parameters to instance variables
       #add the created instance (self) to people class variable
  end

  #have a `search` method to locate all people with a matching `last_name`
  def self.search(last_name)
    #accept a `last_name` parameter
    #search the `people` class attribute for instances with the same `last_name`
    #return a collection of matching instances
  end

  #have a `to_s` method to return a formatted string of the person's name
  def to_s
    #return a formatted string as `first_name(space)last_name`
  end
end

p1 = Person.new("John", "Smith")
p2 = Person.new("John", "Doe")
p3 = Person.new("Jane", "Smith")
p4 = Person.new("Cool", "Dude")

puts Person.search("Smith")

# Should print out
# => John Smith
# => Jane Smith

Answer 1

要将已初始化的person添加到类层次结构变量@@people，请将initialize方法更改为：

def initialize(first_name, last_name)
  @first_name = first_name
  @last_name = last_name

  @@people << self
end

使用Ruby几乎不做任何更改来运行程序

1 个答案: