如何根据输入值查找出现次数

Question

我正在尝试根据下面的 JavaScript Json 对象中的ownerId 输入值查找出现次数。如果ownerId 是数字“1”，则结果应该是3，因为ownerId 出现了3 次。

ownerID: 3 

这是我到目前为止所拥有的...

let inputValue = 1;
let return = "";

const result = jsonResponse.jsonArray[0].info.find(
(arr) => arr.ownderID === inputValue;  );
    
var data = jsonResponse.jsonArray[0].info
        .reduce((counts, result) => {
        const inputItem = result[inputValue];
        counts[inputItem] = (counts[inputItem] || 0) + 1;
        return counts;
      }, {
      });

    return = data;

JSON...

   const jsonResponse = {
   "jsonArray": [
     {
        "info": [
            {
                "ownerId": 1,
                "carType": "Nissan",
                "houseType": "Rancher"
            },
            {
                "ownerId": 1,
                "carType": "Ford",
                "houseType": "Trailer"
            }
        ],
        "familyInfo": {
            "kids": 1,
            "tuition": "yes",
            "parentId": 7
        }
    },
    {
        "info": [
            {
                "ownerId": 3,
                "carType": "Nissan",
                "houseType": "Single"
            }
        ],
        "familyInfo": {
            "kids": 4,
            "tuition": "no",
            "parentId": 11
        }
    },
    {
        "info": [
            {
                "ownerId": 1,
                "carType": "Chevy",
                "houseType": "TownHome"
            }
        ]
    }
  ]
}

我是否可以使用查找和归约以正确的方式解决这个问题？

Answer 1

你就快到了，你需要做的就是数多个

jsonArrays

以及在

info

s

内

看下面的代码，我已经对其进行了适当的注释以使其更加详细。 希望有帮助。

const jsonResponse = {
  "jsonArray": [{
      "info": [{
          "ownerId": 1,
          "carType": "Nissan",
          "houseType": "Rancher"
        },
        {
          "ownerId": 1,
          "carType": "Ford",
          "houseType": "Trailer"
        }
      ],
      "familyInfo": {
        "kids": 1,
        "tuition": "yes",
        "parentId": 7
      }
    },
    {
      "info": [{
        "ownerId": 3,
        "carType": "Nissan",
        "houseType": "Single"
      }],
      "familyInfo": {
        "kids": 4,
        "tuition": "no",
        "parentId": 11
      }
    },
    {
      "info": [{
        "ownerId": 1,
        "carType": "Chevy",
        "houseType": "TownHome"
      }]
    }
  ]
}

// what to search for?
const searchOwnerId = 1;

// reduce to count owner id across multiple items in the list
const counts = jsonResponse.jsonArray.reduce((acc, item) => {
  // count the owner ids inside the infos
  // filter for the ownerId and length works perfect
  
  acc += item.info.filter(
    ({ownerId}) => ownerId == searchOwnerId
  ).length

  return acc

// start reduce with a zero
}, 0);

// final output
console.log(counts)