需要打印嵌套哈希中的所有值

Question

我有一个散列，里面有很多散列，值可能是一个数组，这个数组由许多散列组成，我想打印所有键值对，如果值是数组，那么它必须打印

"pageOfResults": "Array" # I don't want actual array here, I want the string "Array" to be printed. 

Of 如果hash跟在后面，那么就需要打印

"PolicyPayment": "Hash"

否则它需要打印键和值

Key  -> "CurrencyCode": 
Value-> "SGD",

哈希跟随

a={
    "PageOfResults": [
        {
            "CurrencyCode": "SGD",
            "IpAddress": nil,
            "InsuranceApplicationId": 6314,
            "PolicyNumber": "SL10032268",
            "PolicyPayment": {
                "PolicyPaymentId": 2188,
                "PaymentMethod": "GIRO"
            },
            "InsuranceProductDiscountDetail": nil,
            "ProductDetails": {
                "Results": [
                    {
                        "Id": 8113,
                        "InsuranceProductId": 382,
                        "ApplicationProductSelectedId": 62043,
                    },
                    "InsuranceProduct": {
                        "InsuranceProductId": 382,
                        "ProductCode": "TL70-90",
                    },
                ],               
            },
        }
    ]
}

我编写的程序来打印这些值

a.each do |key,value|
    puts "key->" + key.to_s
    if value.is_a?Array
        value.each do |v|
            v.each do |key,value|
                puts "key->"+key.to_s
                puts "value->"+value.to_s       
            end
        end
    else
        puts  "value->"+value.to_s
    end

该程序首先打印哈希级别及其值，我也可以进行递归调用以打印所有值，

但我的问题是，有没有什么办法可以编写 Ruby 风格的代码来轻松实现这一点？或者有什么更好的方法？

Answer 1

简单的?方法可以解决问题：

printer = ->(enum) do
  enum.each do |k, v|
    enum = [k, v].detect(&Enumerable.method(:===))
    if enum.nil?
      puts("Key -> #{k}\nValue -> #{v}")
    else 
      puts ("#{k} -> 'Array'") if v.is_a?(Array)
      printer.(enum)
    end
  end
end

printer.(a)

生产：

PageOfResults -> 'Array'
Key -> CurrencyCode
Value -> SGD
Key -> IpAddress
Value -> 
Key -> InsuranceApplicationId
Value -> 6314
Key -> PolicyNumber
Value -> SL10032268
Key -> PolicyPaymentId
Value -> 2188
Key -> PaymentMethod
Value -> GIRO
Key -> InsuranceProductDiscountDetail
Value -> 
Results -> 'Array'
Key -> Id
Value -> 8113
Key -> InsuranceProductId
Value -> 382
Key -> ApplicationProductSelectedId
Value -> 62043
Key -> InsuranceProductId
Value -> 382
Key -> ProductCode
Value -> TL70-90