Javascript计算有多少车库有carmake1 [英] Javascript Count how many garages have carmake1

问题描述

我有一个表示为车库的数据。
我需要例如计算有carmake1的车库数量

I have an oject of data represented as garages. I need to for example count the number of garages that have carmake1

我试过这个：

count = obj.garages.filter(function(item) { return item === "carmake1" }).length;

但这会返回0，我们知道数据中有实际的carmake1。

but this returns 0 and we know there are actual carmake1's in the data.

以下是数据：

obj = {
  "garages": [{
      "id": "1",
      "carId": "1",
      "tags": {
        "483": "carmake1",
        "485": "carmake3"
      }
    },
    {
      "id": "2",
      "carId": "1",
      "tags": {
        "483": "carmake1",
        "485": "carmake3"
      }
    },
    {
      "id": "3",
      "carId": "2",
      "tags": {
        "484": "carmake2",
        "485": "carmake3"
      }
    },
    {
      "id": "4",
      "carId": "2",
      "tags": {
        "483": "carmake1",
        "485": "carmake3"
      }
    },
    {
      "id": "5",
      "carId": "3",
      "tags": {
        "484": "carmake2",
        "485": "carmake3"
      }
    },
  ]
};

我怎样才能得到它？

推荐答案

您可以通过检查财产来计算。

You could count it with the check of the property.

var obj = obj = { "garages": [{ "id": "1", "carId": "1", "tags": { "483": "carmake1", "485": "carmake3" } }, { "id": "2", "carId": "1", "tags": { "483": "carmake1", "485": "carmake3" } }, { "id": "3", "carId": "2", "tags": { "484": "carmake2", "485": "carmake3" } }, { "id": "4", "carId": "2", "tags": { "483": "carmake1", "485": "carmake3" } }, { "id": "5", "carId": "3", "tags": { "484": "carmake2", "485": "carmake3" } }, ] },
    count = obj.garages.filter(function(item) {
        return item.tags[483] === "carmake1"
    }).length;

console.log(count);

或检查所有属性标记 。

var obj = obj = { "garages": [{ "id": "1", "carId": "1", "tags": { "483": "carmake1", "485": "carmake3" } }, { "id": "2", "carId": "1", "tags": { "483": "carmake1", "485": "carmake3" } }, { "id": "3", "carId": "2", "tags": { "484": "carmake2", "485": "carmake3" } }, { "id": "4", "carId": "2", "tags": { "483": "carmake1", "485": "carmake3" } }, { "id": "5", "carId": "3", "tags": { "484": "carmake2", "485": "carmake3" } }, ] },
    count = obj.garages.filter(function (item) {
        return Object.keys(item.tags).some(function (k) {
            return item.tags[k] === "carmake1"
        });
    }).length;

console.log(count);

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