Question

Working through the classes section in the O’reilley book and they seem to be indicating the below should work:

class Point
  def initialize(x,y)
    @x, @y = x, y
  end

  def x
    @x
  end

  def y
    @y
  end

  def to_s
    "(#@x,#@y)"
  end
end

p = Point.new(5,0)
q = Point.new(p.x*2, p.y*2)
q.x = 0
puts q.x

In theory, I’m expecting it to print 0, instead my compiler is returning a NoMethodError upon trying to perform q.x = 0. Anything jumping out at you guys?

Answer 1

That code should not work, as there is no method x= defined (as per the error message). There might be an errata online?