Ruby多哈希随机值

Question

countries = Hash[ "north" => "nl", "no", "uk" "south" => "sp", "fr", "it" "east" => "ru", "bl", "bg" ]

如何为每个元素（北，南，东）获取随机值？

非常感谢

Answer 1

以下是使用Array#sample的方法：

countries = {"north" => ["nl", "no", "uk"], "south" => ["sp", "fr", "it"], "east" => ["ru", "bl", "bg"] }
countries.map { |_,v| v.sample } # => ["nl", "it", "bg"]
countries.map { |_,v| v.sample } # => ["uk", "it", "bg"]

Answer 2

替代Arup的答案。

countries = {"north" => ["nl", "no", "uk"], "south" => ["sp", "fr", "it"], "east" => ["ru", "bl", "bg"]}
countries.values.map(&:sample)