javascript - JavaScript 中不同的 json 对象

Question

我正在使用 Spring Boot，并生成了一个 json 对象。

[
    {"date":"2017-11-20T17:12:01.340","name":"abc","feedback":"good","category":"AA"},
    {"date":"2017-11-20T17:12:01.340","name":"abc","feedback":"bad","category":"BB"},
    {"date":"2017-11-20T17:12:01.340","name":"abc","feedback":"poor","category":"CC"}

    {"date":"2017-12-15T16:53:02.042","name":"xyz","feedback":"very bad","category":"AA"}
    {"date":"2017-12-15T16:53:02.042","name":"xyz","feedback":"nice","category":"XX"}
    {"date":"2017-12-15T16:53:02.042","name":"xyz","feedback":"okey","category":"YY"}
]

我必须区分日期并获取一个新的 json 对象，如下所示

[
    {"date":"2017-11-20T17:12:01.340", "name":"abc", "feedback_1":"good", "feedback_2":"bad", "feedback_3":"poor", "category_1":"AA", "category_2":"BB", "category_3":"CC"},
    {"date":"2017-12-15T16:53:02.042", "name":"xyz", "feedback_1":"very bad", "feedback_2":"nice", "feedback_3":"poor", "category_1":"AA", "category_2":"XX", "category_3":"YY"}
]

我尝试用 Java 或 JavaScript 获取这种格式。我尽了最大努力使用在线资源，但失败了，因为我是 JavaScript 新手，我该如何解决这个问题？提前致谢。

Answer 1

您可以使用array#reduce创建一个对象并添加计数器来记录JSON的频率，并使用此计数器添加feedback和category。之后从结果中删除计数器。

var data = [ {"date":"2017-11-20T17:12:01.340","name":"abc","feedback":"good","category":"AA"}, {"date":"2017-11-20T17:12:01.340","name":"abc","feedback":"bad","category":"BB"}, {"date":"2017-11-20T17:12:01.340","name":"abc","feedback":"poor","category":"CC"}, {"date":"2017-12-15T16:53:02.042","name":"xyz","feedback":"very bad","category":"AA"}, {"date":"2017-12-15T16:53:02.042","name":"xyz","feedback":"nice","category":"XX"}, {"date":"2017-12-15T16:53:02.042","name":"xyz","feedback":"okey","category":"YY"} ];

var result = Object.values(data.reduce((r,o) => {
  var key = o.data + "|" + o.name;
  r[key] = r[key] || {date: o.date, name: o.name, count:1};
  r[key] = Object.assign({}, r[key], {['feedback_'+r[key].count] : o.feedback, ['category_'+r[key].count]: o.category, count : r[key].count+1});
  return r;
},{}));

result.forEach(o => delete o.count);

console.log(result);