Ruby每个多数组[关闭]

Question

web_user_agents = {
    "linux" => [
            "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.5) Gecko/2008122903 Gentoo Iceweasel/3.0.5",
            "Opera/5.0 (Linux 2.0.38 i386; U) [en]",
    ],
    "windows" => [
            "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2a1pre) Gecko",
            "Opera/9.63 (Windows NT 5.2; U; en) Presto/2.1.1",
    ],
}

如何使用 key 迭代每个元素？

预期的输出是：

"linux","Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.5) Gecko/2008122903 Gentoo Iceweasel/3.0.5"
"linux","Opera/5.0 (Linux 2.0.38 i386; U) [en]"
"windows","Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2a1pre) Gecko"
"windows","Opera/9.63 (Windows NT 5.2; U; en) Presto/2.1.1",

Answer 1

你可以遍历哈希

web_user_agents.map { |k,v| v.map { |val| [k, val] } }.flatten

#=>[
#=> "linux","Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.0.5) Gecko/2008122903 Gentoo Iceweasel/3.0.5"
#=> "linux","Opera/5.0 (Linux 2.0.38 i386; U) [en]"
#=> "windows","Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2a1pre) Gecko"
#=> "windows","Opera/9.63 (Windows NT 5.2; U; en) Presto/2.1.1"
#=>]

Answer 2

假设您真的不想在最后一行使用终止逗号，请尝试：

web_user_agents.keys.each do |agent|
    web_user_agents[agent].each do |line|
        puts %Q("#{agent}","#{line}")
    end
end

请注意，哈希是以不确定的顺序存储的；如果键的产生方式对您很重要，您可能需要对它们进行排序，或者使用数组而不是散列来存储它们。

[编辑：在最新版本的 Ruby 中，哈希键顺序被保留。]

Answer 3

以下循环遍历主哈希。

 web_user_agents.each_pair do |k,v| 
   puts "#{k} => #{v}"
 end

你可以这样嵌套：

 web_user_agents.each_pair do |k,v|
   v.each do |value|
      puts "#{k} => #{value}"
   end
 end