Ruby:用其他散列中的匹配值交换散列键

Question

我有这些散列:

hash  = {1 => "popcorn", 2 => "soda"}
other_hash = {1 => "dave", 2 => "linda", 3 => "bobby_third_wheel"}

我想用与第二个哈希中的 id 关联的名称替换 id 引用，如果 other_hash 中有一条记录没有任何匹配项，则应该将其删除结果哈希。像这样:

the_one_hash_to_rule_them_all = {"dave" => "popcorn", "linda" => "soda"}

Answer 1

您可以轻松地在带有名称的“主要”哈希上使用此each_with_object 方法。

other_hash.each_with_object({}) { |(id, name), h| h[name] = hash[id] if hash.key?(id) }
# => {"dave"=>"popcorn", "linda"=>"soda"}