Ruby - 将两个散列与一些类似的键合并

Question

本质上我只想合并两个哈希中出现的键。最终目标是增加或乘以这些值。

hash1 = {"a" => 1, "b" => 2, "c" => 3 }
hash2 = {"a" => 1, "b" => 2, "c" => 3, "d" => 4, "e" => 5}
{"a" => 2, "b" => 4, "c" => 6 }

这在某种意义上添加了正确的值，但也返回了 d 和 e。

hash1.merge(hash2) { |key1, value1, value2| value1 + value2 }
#=> {"a" => 2, "b" => 4, "c" => 6, "d" => 4, "e" => 5}

Answer 1

尝试下面的代码

hash1 = {"a" => 1, "b" => 2, "c" => 3 }
hash2 = {"a" => 1, "b" => 2, "c" => 3, "d" => 4, "e" => 5}


(hash1.keys & hash2.keys).map{ |key| [key, hash1[key] + hash2[key]]}.to_h
 => {"a"=>2, "b"=>4, "c"=>6}