我对ruby不是很有经验，所以我正在努力格式化一段数据。
我有这个散列，其中包含一些具有相同值的键，例如:
{"key" => "value1", "key2" => "value2", "key3" => "value3", "key4" => "value1", "key5" => "value2" ..}
我想把它变成一个包含按值分组的键的数组
[["key","key4"],["key2","key5"],["key3"]]
最佳答案
new_hash = {}
hash.each do |key, value|
new_hash[value] ||= []
new_hash[value] << key
end
array = new_hash.values # => [["key", "key4"], ["key2", "key5"], ["key3"]]
关于ruby - 散列成分组数组，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9557485/