fiber.rb

#take every sentence
counts = Hash.new(0)
File.foreach("sample.txt") do
  |line|
  line.scan(/\w+/) do
    |word|
    word = word.downcase
    counts[word] += 1
  end
end

counts.keys.sort.each{
  |k|
  p "#{k}:#{counts[k]}"
}

#another way take every sentece in file
words = Fiber.new do
  File.foreach("sample.txt") do
    |line|
    line.scan(/\w+/) do
      |word|
      Fiber.yield word.downcase
    end
  end
  nil
end

counts = Hash.new(0)
while word = words.resume
  counts[word] += 1
end

counts.keys.sort.each {
  |k|
  p "#{k}:#{counts[k]}"
}


two = Fiber.new do
  num = 2
  loop do
    Fiber.yield(num) unless num % 3 == 8
    num += 2
  end
end

2.times {print two.resume, " "}