The simplest example of read_attr, write_attr in a class.

class Person  
  attr_reader :name, :age   
  attr_writer :name, :age   # creates the setter methods       
    
  def initialize(name)  
    [@name](http://twitter.com/name) = name  
  end  
endmike = Person.new('Mike')   
mike.age = 20               # calling setter method  
mike.age                    # calling getter method, returns 20

Reference

The example is verbatim from an easy to follow tutorial on Ruby class: https://medium.com/@rondwalker22/how-getter-setter-methods-work-in-ruby-c5f5da07f99