protected that makes a method private, but within the scope of a class rather than within a single object. : Protected « Class « Ruby

1. Ruby
2. Class
3. Protected

protected that makes a method private, but within the scope of a class rather than within a single object.

# you can call a protected method from the scope of the methods of any object 
# that's a member of the same class:

class Person
  def initialize(age)
    @age = age
  end

  def age
    @age
  end

  def age_difference_with(other_person)
    (self.age - other_person.age).abs
  end

  protected :age
end

fred = Person.new(34)
chris = Person.new(25)
puts chris.age_difference_with(fred)
puts chris.age

 

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