如何应用过滤器以使用 AngularJS 获取 JSON 数组中 JSON 对象中具有相同值的元素

Question

我有一个包含多个（动态）JSON 对象的 JSON 数组。我需要比较对象并选择在所有对象中具有相同值的键。我的 JSON 看起来像，

[
    {
        "CreateAccountName":"Joseph",
        "CreateDateTime":"0001-01-01T00:00:00",
        "Description":"Utilization of services",
        "Type":2,
        "Id":1000000001,
        "Count":1,
        "ModifiedAccountName":"",
        "ModifiedDateTime":"2016-10-04T10:16:40.5190025",
        "Name":"Utilization of services",
        "CardCount":0,
        "Target":95,
        "UniversalId":"SDFOPIJ-SDFGLKJ-ER234-234LF",
        "AccountId":0,
        "AccountName":"Joseph"
    },

    {
        "CreateAccountName":"Joseph",
        "CreateDateTime":"0001-01-01T00:00:00",
        "Description":"Utilization of Food",
        "Type":2,
        "Id":1000000001,
        "Count":1,
        "ModifiedAccountName":"",
        "ModifiedDateTime":"2016-10-04T10:16:40.5190025",
        "Name":"Utilization of Food",
        "CardCount":0,
        "Target":95,
        "UniversalId":"SDFOPIJ-SDFGLKJ-ER234-234LF",
        "AccountId":0,
        "AccountName":"Joseph"
    },

    {
        "CreateAccountName":"Joseph",
        "CreateDateTime":"0001-01-01T00:00:00",
        "Description":"Utilization of services",
        "Type":2,
        "Id":1000000001,
        "Count":1,
        "ModifiedAccountName":"",
        "ModifiedDateTime":"2016-10-04T10:16:40.5190025",
        "Name":"Utilization of services",
        "CardCount":0,
        "Target":95,
        "UniversalId":"SDFOPIJ-SDFGLKJ-ER234-234LF",
        "AccountId":0,
        "AccountName":"Joseph"
    }
]

我想获取具有相同值的密钥。例如，CreateAccountName。它在所有对象中具有相同的值。

棘手的情况是，密钥本身是动态的。我无法对密钥进行硬编码并进行比较。密钥名称可能会更改，或者可能会出现另一组密钥。我正在寻找一种通用解决方案来比较和获取对象的 "intersection"。

Answer 1

您只需使用 Array.reduce()

即可

var json = [
    {
        "CreateAccountName":"Joseph",
        "CreateDateTime":"0001-01-01T00:00:00",
        "Description":"Utilization of services",
        "Type":2,
        "Id":1000000001,
        "Count":1,
        "ModifiedAccountName":"",
        "ModifiedDateTime":"2016-10-04T10:16:40.5190025",
        "Name":"Utilization of services",
        "CardCount":0,
        "Target":95,
        "UniversalId":"SDFOPIJ-SDFGLKJ-ER234-234LF",
        "AccountId":0,
        "AccountName":"Joseph"
    },

    {
        "CreateAccountName":"Joseph",
        "CreateDateTime":"0001-01-01T00:00:00",
        "Description":"Utilization of Food",
        "Type":2,
        "Id":1000000001,
        "Count":1,
        "ModifiedAccountName":"",
        "ModifiedDateTime":"2016-10-04T10:16:40.5190025",
        "Name":"Utilization of Food",
        "CardCount":0,
        "Target":95,
        "UniversalId":"SDFOPIJ-SDFGLKJ-ER234-234LF",
        "AccountId":0,
        "AccountName":"Joseph"
    },

    {
        "CreateAccountName":"Joseph",
        "CreateDateTime":"0001-01-01T00:00:00",
        "Description":"Utilization of services",
        "Type":2,
        "Id":1000000001,
        "Count":1,
        "ModifiedAccountName":"",
        "ModifiedDateTime":"2016-10-04T10:16:40.5190025",
        "Name":"Utilization of services",
        "CardCount":0,
        "Target":95,
        "UniversalId":"SDFOPIJ-SDFGLKJ-ER234-234LF",
        "AccountId":0,
        "AccountName":"Joseph"
    }
];

var intersection = json.reduce(function(result, item) {
  Object.keys(result).forEach(function(key) {
    if(! item.hasOwnProperty(key) || item[key] !== result[key]) delete result[key];
  });
  return result;
});

console.log(intersection)

如何应用过滤器以使用 AngularJS 获取 JSON 数组中 JSON 对象中具有相同值的元素

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