如何检查哈希键是否与数组中的值匹配

I have:

arr = ['test', 'testing', 'test123']
ht = {"test": "abc", "water": "wet", "testing": "fun"}

我如何选择其中的值ht谁的密钥匹配arr?

ht_new = ht.select {|hashes| arr.include? hashes}
ht_new # => "{"test": "abc", "testing": "fun"}"

此外，我们如何从以下位置返回值：

arr = ["abc", "123"]
ht = [{"key": "abc", "value": "test"}, {"key": "123", "value": "money"}, {"key": "doremi", "value": "rain"}}]
output # => [{"key": "abc", "value": "test"}, {"key": "123", "value": "money"}]

只需要稍作改变：

ht.select { |k,_| arr.include? k.to_s }
  ##=> {:test=>"abc", :testing=>"fun"}

See 哈希#select http://ruby-doc.org/core-2.5.1/Hash.html#method-i-select.

块变量_（有效的局部变量），即 key 的值k，向读者表明它不用于块计算。有些人更喜欢这样写|k,_v|，或类似的东西。