Question

我的脚本在另一个空数组中返回一个空数组（或者我猜它不是空的，因为另一个数组中还有另一个空数组）。

我有if条件，检查外部数组是否为空。它说它不是空的，因为它包含一个空数组。我需要帮助才能让它返回false。我相信最好的方法是检查内部数组是否为空，但我不确定内部数组的创建位置。

这里是检查数组是否为空的方法的代码：

def directory_check(directory_list, save_to_file, today_date, output_file, output_extension, results_file_output)
  if directory_list.empty? == false
    # changes the working directory to the file output directory for the file
    Dir.chdir(save_to_file)

    # writes the array contents into a new file
    file_name = output_file + "_" + today_date + output_extension
    puts Time.now.to_s + "  >  " +  "Saving contents to:  " + results_file_output + file_name
    puts ""
    File.open(file_name, "a+") do |f| 
      directory_list.each { |element| f.puts(element) }
    end
  else
    puts Time.now.to_s + "  >  " +  "This directory does not contain any subdirectories that are older than 24 hours"
    exit
  end
end

directory_list返回[[]]，empty?返回false。

我有另一种方法将项目存储到数组中，但我无法弄清楚为什么数组中有数组：

def store_directories(directories, folder_to_exclude)    
  # updates search directory for each value for the directories hash
  subdir_list = Array.new
  directories.each do |element|
    directory = "#{element}"
    puts Time.now.to_s + "  >  " +  "Updating search directory: " + directory
    Dir.chdir(directory)

    # outputs only subdirectories with a creation date of older than 24 hours, except for folders names 'Archive'
    Dir.glob("*.*").map(&File.method(:realpath))
    puts Time.now.to_s + "  >  " +  "Gathering subdirectories..."
    puts ""

    # Stores the contents of the query into an array and appends to the list for each iteration of the array
    subdir_list << Dir.glob("*").map(&File.method(:realpath)).reject  {|files|
     (not File.directory?(files) &&
      (File.mtime(files) < (Time.now - (60*1440))) && 
      (not files == directory + folder_to_exclude))
    }

    puts ""
    puts "Adding new folders to the list..."
    puts ""
    puts "Excluding: " + directory + folder_to_exclude
    puts ""
    puts subdir_list
    puts " "
  end
  return subdir_list
end

我将一组目录传递给store_directories方法。

Answer 1

directory_list返回[[]]，empty?返回false。

它正常工作并返回正确的值，因为你的directory_list不是空数组，它包含空数组。您需要使用 Array#flatten

> [[]].flatten.empty?
#=> true

＆＃39;空＆＃39？;返回＆＃39; false＆＃39;对于空数组中的空数组

1 个答案: