完成对数组元素的迭代后重置计数器答案

【问题标题】：Reset counter after finishing iterating with the array elements完成对数组元素的迭代后重置计数器
【发布时间】：2017-12-15 23:52:28
【问题描述】：

我正在编写此代码，但在迭代数组中的所有元素后，我找不到重置计数器的正确方法。

这个想法是，在播放列表中的最后一首歌曲后，您将进入第一首歌曲。这是我的代码，非常感谢您的帮助。提前致谢！

class Playlist
  attr_accessor :songs
  def initialize (name,songs)
    @name = name
    @songs = songs
  end

  def display_name
    @name
  end

  def number_of_songs
    "There are #{@songs.count} songs in the #{display_name}"
  end

  def add_song(song)
    @songs << song
    @songs
  end

  def next_song
    i = 0
    while i != 9
      p "Playing song: #{@songs[i]}"
      p "skip song? (Y/N)"
      user_input = gets.chomp
      if user_input.downcase == "y" && i != 8
        i += 1
      elsif user_input.downcase == "n" && i != 8
        puts "Playing song"
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        sleep(1)
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        sleep(1)
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        puts
        puts
        i+=1
      end
    end
  end
end

playlist = Playlist.new("The Ultimate Playlist",["In My Life","Naive","She Moves In Her Own Way","Skinny Love","All My Life","All The Small Things","Real"])

p playlist.display_name
p playlist.number_of_songs
p playlist.add_song("California(Here We Come)")
puts
p playlist.next_song

【问题讨论】：

如果你有一个数组，比如a=(1..10).to_a而不是迭代，你可以旋转数组a.rotate!然后一直播放a[0]

标签： arrays ruby ruby-on-rails-3 loops counter

【解决方案1】：

上完课后，我找到了解决办法。这很容易实现，但我知道有更好的选择来解决这个问题。谢谢大家的帮助！ :D

PD：如果您愿意，请评论您找到的其他解决方案

class Playlist
  attr_accessor :songs
  def initialize (name,songs)
    @name = name
    @songs = songs
  end

  def display_name
    @name
  end

  def number_of_songs
    "There are #{@songs.count} songs in the #{display_name}"
  end

  def add_song(song)
    @songs << song
    @songs
  end

  def next_song
    max =@songs.length
    i = 0
    finish = ""
    puts "Write Play to start the playlist (#{@name})"
    puts
    promt =">"
    print promt
    while finish.downcase != "play"
      finish = gets.chomp
      i = 0
      puts
    while i <max
      p "Playing song: #{@songs[i]}"
      p "skip song? (Y/N) or exit to end the playlist"
      print promt
      user_input = gets.chomp
      if user_input.downcase == "y" && i != 8
        i += 1
      elsif user_input.downcase == "n" && i != 8
        puts "Playing song"
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        sleep(1)
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        sleep(1)
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        sleep(1)
        print'.'
        puts
        puts
        i+=1
      elsif user_input.downcase == "exit"
        exit!
      end
    end
    puts
    p "Restarting playlist"
    puts
    puts "Write Play to start the playlist (#{@name})"
    puts
  end 
end
end

playlist = Playlist.new("The Ultimate Playlist",["In My Life","Naive","She Moves In Her Own Way","Skinny Love","All My Life","All The Small Things","Real"])

p playlist.display_name
p playlist.number_of_songs
p playlist.add_song("California(Here We Come)")
puts
p playlist.next_song

【讨论】：