Fiber FizzBuzz and Fibonacci (silly examples)

fiber_dispatcher.rb

require 'fiber'

@dispatcher = Fiber.new do
  loop do
    [@a, @b].sample.transfer rand 1..100
  end
end

@a = Fiber.new do |work|
  loop do
    sleep 3
    @dispatcher.transfer puts "worker a finished unit #{work} ..."
  end
end

@b = Fiber.new do |work|
  loop do
    sleep 3
    @dispatcher.transfer puts "worker b finished unit #{work} ..."
  end
end

@dispatcher.resume

fiber_fizzbuzz.rb

require 'fiber'

@pool = []

1.upto 100 do |n|
  @pool << Fiber.new do
    if n % 15 == 0
      Fiber.yield 'FizzBuzz'
    elsif n % 3 == 0
      Fiber.yield 'Fizz'
    elsif n % 5 == 0
      Fiber.yield 'Buzz'
    else
      Fiber.yield n
    end
  end
end

@pool.each { |fiber| puts fiber.resume }

fiber_holidays.rb

require 'fiber'

class Holidays
  attr_reader :halloween, :thanksgiving, :christmas

  def initialize
    @halloween = Fiber.new do
      @thanksgiving.transfer puts 'Trick or treat!'
      loop { Fiber.yield puts 'No more candy this season...' }
    end

    @thanksgiving = Fiber.new do
      @christmas.transfer puts 'Gobble, gobble!'
      loop { Fiber.yield puts 'The turkeys have gone into hiding...' }
    end

    @christmas = Fiber.new do
      Fiber.yield puts 'Ho, ho, ho!'
      loop { Fiber.yield puts 'The presents have all been opened...' }
    end
  end
end

season = Holidays.new
season.halloween.transfer

season.halloween.transfer
season.thanksgiving.transfer
season.christmas.transfer

fibonacci_fiber.rb

require 'fiber'

fibonacci_fiber = Fiber.new do
  x, y = 0, 1
  loop do
    Fiber.yield x
    x, y = y, x + y
  end
end

10.times.map { fibonacci_fiber.resume }
#=> [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

fibonacci_fiber.alive?
#=> true

fibonacci_fiber.resume
#=> 55

Please don't delete it.. Its useful.. :-)