class Example attr_accessor :a, :b def initialize(a,b) @a = a @b = b end end @ex = Example.new("A", "B") @ex.a # => "A"
attr_accessor is a method that defines the setter and getter methods for instance variables that match the argument symbol. In this case, “a” is a getter and “=a” is a setter. In other words, attr_accessor :a made the method “a”,”=a”.
@ex.methods.grep /a/ # => [:a.:a=,...]