fiber = Fiber.new {
  puts 'Hello, Fiber'
  Fiber.yield
  puts 'Hello (again)'
}

fiber.resume

fiber.resume

fiber.resume

fiber = Fiber.new { |first|
  puts first
  
  second = Fiber.yield('goodbye')
  
  puts second
  
  'goodbye (again)'
}

puts fiber.resume('hello')
puts fiber.resume('hello (again)')

fib = Fiber.new {
  a, b = 0, 1
  
  loop do
    a, b = b, a+b
    
    Fiber.yield(a)
  end
}

puts 10.times.map { fib.resume }
puts fib.resume
puts fib.resume

fib.resume

fiber = Fiber.new {
  puts 'OMG'
}

Thread.fork {
  fiber.resume
}.join

fiber = Fiber.new {
  Thread.fork {
    Fiber.yield
  }.join
}

fiber.resume