attr vs attr_accessor [英] attr vs attr_accessor

问题描述

在Ruby中，实例变量attr，attr_reader，attr_writer和attr_accessor有四种不同的getter和setter方法.问题是，是否在Ruby attr :dilithium中与attr_reader :dilithium相同，并且如果传递了附加参数true，则与attr_accessor :dilithium相同吗?那就是

In Ruby there are four different getter and setter methods for instance variables, attr, attr_reader, attr_writer, and attr_accessor. The question is, is in Ruby attr :dilithium, the same as attr_reader :dilithium, and identical to attr_accessor :dilithium if an additional parameter true is passed? That is to say is

class Enterprise
  attr :dilithium, true

与

class Enterprise
  attr_accessor :dilithium

两个功能attr和attr_accessor或多或少是多余的吗?

Are the two functions attr and attr_accessor more or less redundant?

推荐答案

一个区别是attr_accessor和朋友更加清晰，并且attr的可选布尔参数现在为

One difference is that attr_accessor and friends are clearer, and the optional boolean argument to attr is now deprecated. Other than that, and the fact that attr has no documentation, there's no real difference.

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