WebbIn Ruby, object methods are public by default, while data is private. To access and modify data, we use the attr_reader and attr_writer. attr_accessor is a shortcut method when you need both attr_reader and attr_writer. Since both reading and writing data are common, the idiomatic method attr_accessor is quite useful. Usage Webb我最近有完全一樣的問題。 我要做的是創建一個繼承自Nokogiri::HTML::Document ，然后重寫new類方法以解析文檔，然后將URL保存在帶有訪問器的實例變量中：. require 'nokogiri' require 'open-uri' class Webpage < Nokogiri::HTML::Document attr_accessor :url class << self def new(url) html = open(url) self.parse(html).tap do d d.url = url end end end end

Ruby’s attr_accessor, attr_reader and attr_writer Mix & Go

Webbattr_accessor (*name) -> [Symbol] [ permalink ] [ rdoc ] [ edit] インスタンス変数 name に対する読み取りメソッドと書き込みメソッドの両方を定義します。 例 class User attr_accessor :name # => [:name, :name=] # 複数の名前を渡すこともできる attr_accessor :id, :age # => [:id, :id=, :age, :age=] end WebbRuby user's guide Accessors What is an accessor? We briefly discussed instance variables in an earlier chapter, but haven't done much with them yet. An object's instance variables are its attributes, the things that generally distinguish it … on the wall art gallery barbados

Ruby: attr_reader &attr_accessor用法 - CSDN博客

Webb#添加一个可 read 属性，在 class 外部只可 read 该实例变量（等同于通过 instance.arg 方法），而不可对该变量赋值（相当于调用 instance.arg= 方法不存在） # attr_reader 的限定有点类似 C 中 int const * p的作用，限定的是变量，而非变量指向的对象 class C2 … Webb2 apr. 2024 · In Ruby, the attr_* methods are in charge of the member access control. attr. The attr method creates an instance variable and a getter method for each attribute … Webb16 mars 2024 · One option is to continue using the attr_accessor method. This method provides a bit of fun Ruby magic to our code, by allowing us to tell Ruby that the argument list of :symbols we provided should be added to our class as instance variables. on the wall - fetty luciano lyrics