Break out of a block


def oscillator
  x = 1
  while true
    yield x
    x *= -2
  end
end
oscillator { |x| puts x; break if x.abs > 50; }

1.	break ends the immediately enclosing loop.
2.	Stopping an Iteration
3.	Break if
4.	Read till 'quit'

Break out of a block : break « Statement « Ruby