轉換紅寶石陣列哈希爲一個哈希

Question

我有以下陣列：

array = [{"a" => 2}, {"b" => 3}, {"a" => nil}, {"c" => 2}, {"b" => nil}] 

我想將其轉換成1個大散列但保留所有的值，所以我希望它看起來像下面這樣：

{"a" => [2, nil], "b" => [3, nil], "c" => [2]} 

我可以關閉array.inject({}) {|s, h| s.merge(h)}}，但它會覆蓋這些值。

任何想法都讚賞！

Answer 1

array = [{"a" => 2}, {"b" => 3}, {"a" => nil}, {"c" => 2}, {"b" => nil}] 
a = array.each_with_object(Hash.new([])) do |h1,h| 
    h1.each{|k,v| h[k] = h[k] + [v]} 
end 
a # => {"a"=>[2, nil], "b"=>[3, nil], "c"=>[2]} 

Answer 2

array = [{"a" => 2}, {"b" => 3}, {"a" => nil}, {"c" => 2}, {"b" => nil}] 
res = {} 

array.each do |hash| 
    hash.each do |k, v| 
    res[k] ||= [] 
    res[k] << v 
    end 
end