ruby - Sum 2 具有相同键的散列属性

Question

我有 2 个哈希，例如:

{'a' => 30, 'b' => 14}
{'a' => 4, 'b' => 23, 'c' => 7}

其中 a、b 和 c 是对象。我怎样才能将这些散列的键相加以获得新的散列，例如:

{'a' => 34, 'b' => 37, 'c' => 7}

Answer 1

a_hash = {'a' => 30, 'b' => 14}
b_hash = {'a' => 4, 'b' => 23, 'c' => 7}

a_hash.merge(b_hash){ |k, a_value, b_value| a_value + b_value }
=> {"a"=>34, "b"=>37, "c"=>7}

b_hash.merge(a_hash){ |k, b_value, a_value| a_value + b_value }
=> {"a"=>34, "b"=>37, "c"=>7}