Question

lines = ["title= flippers dippers track= 9", "title= beaner bounce house track= 3", "title= fruit jams live track= 12"]
songs_formatted = []
songs = {}

lines.each do |line|
    line =~ /title=\s?(.*)\s+t/ 
    title = "#$1".strip
    songs[:title] = title

    line =~ /track=\s?(.*)/
    track = "#$1".strip
    songs[:track] = track

    songs_formatted << songs
end

p songs_formatted

#=> [{:title=>"flippers dippers", :track=>"9"}]
#=> [{:title=>"beaner bounce house", :track=>"3"}, {:title=>"beaner bounce house", :track=>"3"}]
#=> [{:title=>"fruit jams live", :track=>"12"}, {:title=>"fruit jams live", :track=>"12"}, {:title=>"fruit jams live", :track=>"12"}]

每个连续的行都会覆盖它之前的行。为什么这不是按顺序添加的？期望的结果是：

songs_formatted = [{:title=>"flippers dippers", :track=>"9"}, {:title=>"beaner bounce house", :track=>"3"}, {:title=>"fruit jams live", :track=>"12"}]

Answer 1

需要在每个循环中放置songs哈希。工作代码：

lines = ["title= flippers dippers track= 9", "title= beaner bounce house track= 3", "title= fruit jams live track= 12"]
songs_formatted = []

lines.each do |line|
  songs = {} 

  line =~ /title=\s?(.*)\s+t/ 
  title = "#$1".strip
  songs[:title] = title

  line =~ /track=\s?(.*)/
  track = "#$1".strip
  songs[:track] = track

  songs_formatted << songs
end

p songs_formatted

正确输出：

#=> [{:title=>"flippers dippers", :track=>"9"}, {:title=>"beaner bounce house", :track=>"3"}, {:title=>"fruit jams live", :track=>"12"}]

Answer 2

由于每行需要一个输出，因此可以使用map。此外，您可以使用一个正则表达式提取两者。

lines.map do |line|
  title, track = line.match(/title=\s?(.*?)\s*track=\s?(\d+)/)[1,2]
  {title: title, track: track}
end

这可以为您提供所需的输出。

如何将哈希附加到数组？

2 个答案: