javaScript map/reduce 在链接对象上

Question

我几乎没有像数据库中的表那样相互链接的对象：

var data = {}
data.Contracts = {
    "RefferencesObject": {
        "Refferencs": [
            {                
                "amount": 0,
                "refState": "a",               
                "refference": "REF1"
            },

            {                
                "amount": 850,
                "refState": "a",               
                "refference": "REF2"
            },
            {                
                "amount": 2000,
                "refState": "a",               
                "refference": "REF3"
            }            
        ]
    },
    "CardsObject": {
        "Cards": [
            {               
                "refference": "REF1",
                "card": "0001"
            },
            {               
                "refference": "REF2",
                "card": "0002"
            },
            {                
                "refference": "REF2",
                "card": "0003"
            },
            {                
                "refference": "REF2",
                "card": "0004"
            },
            {                
                "refference": "REF3",
                "card": "0003"
            },
            {                
                "refference": "REF3",
                "card": "0005"
            }
        ]
    },
    "CardsStatesObject": {
        "CardsStates": [
            {                
                "cardState": "active",                
                "card": "0001"
            },
            {

                "cardState": "closed",               
                "card": "0002"
            },
            {

                "cardState": "closed",               
                "card": "0003"
            },
            {

                "cardState": "active",               
                "card": "0004"
            },
            {

                "panState": "closed",               
                "pan": "0005"
            },
        ]
    }
};

而且我必须创建一个包含所有链接数据的对象，如下所示：

"ResultObject" : {
    {
        "amount": 0,
        "refState": "a",               
        "refference": "REF1",
        "card" : "0001",
        "cardState" : "active"
    },
    {
        "amount": 0,
        "refState": "a",               
        "refference": "REF2",
        "card" : "0002",
        "cardState" : "closed"
    },
    {
        "amount": 0,
        "refState": "a",               
        "refference": "REF2",
        "card" : "0003",
        "cardState" : "closed"
    },
    {
        "amount": 0,
        "refState": "a",               
        "refference": "REF2",
        "card" : "0004",
        "cardState" : "closed"
    },
    {
        "amount": 0,
        "refState": "a",               
        "refference": "REF3",
        "card" : "0003",
        "cardState" : "active"
    },
    {
        "amount": 0,
        "refState": "a",               
        "refference": "REF3",
        "card" : "0005",
        "cardState" : "active"
    }
}

现在我有丑陋的大循环，它不喜欢这是连接对象的最佳方式。也许我可以使用 map/reduce 函数来自动化我需要的连接？

Answer 1

下面的代码生成一个对象数组

 //I make some references to make coding easier and lines concise.
 References = data.Contracts.RefferencesObject.Refferencs;
 cardsObjects = data.Contracts.CardsObject.Cards;
 cardsStates =  data.Contracts.CardsStatesObject.CardsStates;

resultArray = References.map(function(item, index){
  for (i=0;i<cardsObjects.length;i++){
    if (cardsObjects[i].refference==item.refference){
        item.card = cardsObjects[i].card;
        for (j=0; j < cardsStates.length;j++){
            if (cardsStates[j].card==item.card){
                item.cardState=cardsStates[j].cardState;
            }

        }
    }
  }
  return item;
})

现在，我不确定您需要的最终格式。但是如果你想把所有这些都放在一个对象中，你可以这样写：

var resultObj = {'result' : resultArray };

但是，除非您对 resultObj 中的项目有适当有意义的名称，否则我建议坚持使用数组并遍历数组的数字索引。

希望对您有所帮助

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