如何将键值对添加到 object

Question

我有一个包含嵌套对象数组的数据源。 我已经能够 select 键值对，现在我想将这些值添加到 object 的顶层，即嵌套的 object 之外。

初始数组：

 data= [
  {
    "flowId": 7079,
    "flowName": "jackson-demo",
    "version": 1,
    "CreatedDate": "2020-04-02",
    "UpdateDate": "",
    "LastRunDate": "2020-04-02",
    "active": false,

"properties": [
  {
    "id": 7080,
    "key": "country",
    "value": "in",
    "category": "General"
  },
  {
    "id": 7081,
    "key": "source",
    "value": "hive",
    "category": "General"
  }
  ]

  },
  {

"flowId": 7079,
"flowName": "jackson-demo",
"version": 1,
"CreatedDate": "2020-04-02",
"UpdateDate": "",
"LastRunDate": "2020-04-02",
"active": false,

"properties": [
  {
    "id": 7080,
    "key": "country",
    "value": "au",
    "category": "General"
  },
  {
    "id": 7081,
    "key": "source",
    "value": "aws",
    "category": "General"
  }
  ]

} ]

使用下面的代码，我可以获得键值对：

 for (var i = 0; i < data.length; i++) {
  data[i].properties.forEach((arrayItem, i) => {
    if (arrayItem.key === 'country') {
      console.log('Key: ' + arrayItem.key + ' ' + 'Value: ' + arrayItem.value);
    }
  });
}

Output 代码：

Key: country Value: au 
Key: country Value: in 

如何将这些值推回数组中，以便我的新数组如下所示：

data= [
  {
    "flowId": 7079,
    "flowName": "jackson-demo",
    "version": 1,
    "CreatedDate": "2020-04-02",
    "UpdateDate": "",
    "LastRunDate": "2020-04-02",
    "active": false,
    "country": "in"

"properties": [
  {
    "id": 7080,
    "key": "country",
    "value": "in",
    "category": "General"
  },
  {
    "id": 7081,
    "key": "source",
    "value": "hive",
    "category": "General"
  }
  ]

  },
  {

"flowId": 7079,
"flowName": "jackson-demo",
"version": 1,
"CreatedDate": "2020-04-02",
"UpdateDate": "",
"LastRunDate": "2020-04-02",
"active": false,
"country":"au"

"properties": [
  {
    "id": 7080,
    "key": "country",
    "value": "au",
    "category": "General"
  },
  {
    "id": 7081,
    "key": "source",
    "value": "aws",
    "category": "General"
  }
  ]

} ]

Answer 1

尝试使用扩展运算符更新data[i] ：

 for (var i = 0; i < data.length; i++) {
  data[i].properties.forEach((arrayItem, i) => {
    if (arrayItem.key === 'country') {
      data[i] = { ...data[i] , arrayItem }
    }
  });
}

Answer 2

您可以使用Object.fromEntries ：

for (let item of data) {
  Object.assign(item,
    Object.fromEntries(item.properties.map(({key, value}) => [key, value]))
  );
}

如果您只想添加其中一些对，您可以将.filter到.map结果，或者如果您只需要一个（“国家”），请使用更基本的编程模式：

for (let item of data) {
  item.country = item.properties.find(({key}) => key == "country").value;
}

Answer 3

这将创建一个新数组，其中包含具有附加country /地区属性的对象副本（如果找到）：

 const addCountry = data => data.map (({properties, ...rest}) => { const country = properties.find (({key}) => key == 'country') return {... rest, ... (country? {country: country.value}: {}), properties } }) const data = [{flowId: 7079, flowName: "jackson-demo", version: 1, CreatedDate: "2020-04-02", UpdateDate: "", LastRunDate: "2020-04-02", active: false, properties: [{id: 7080, key: "country", value: "in", category: "General"}, {id: 7081, key: "source", value: "hive", category: "General"}]}, {flowId: 7079, flowName: "jackson-demo", version: 1, CreatedDate: "2020-04-02", UpdateDate: "", LastRunDate: "2020-04-02", active: false, properties: [{id: 7080, key: "country", value: "au", category: "General"}, {id: 7081, key: "source", value: "aws", category: "General"}]}]; console.log ( addCountry (data) )

 .as-console-wrapper {min-height: 100%;important: top: 0}

如果此提取已经满足了 output 中properties的唯一使用，那么您可以跳过 output 中的properties行并拥有更多轻量级版本以进行进一步处理。

当然，我们可以选择改变原始数据，但我们不是野蛮人，对吧？