Attr_Reader || Attr_Writer || Attr_Accessor

attr_accessor.md

If you write:

attr_writer :age

It is the equivalent of:

def age=(value)
  @age = value
end

Writing:

attr_reader :age

That gets translated into:

def age
  @age
end

Writing:

attr_accessor :age

Is translated to:

def age=(value)
  @age = value
end

and

def age
  @age
end