JavaScript 合并具有相同键的数组对象

Question

我有一个包含多个对象的数组，其中一些对象具有相同的键（Question 和 QuestionId），例如：

    var jsonData = [
            {
                Question: "Was the training useful?",
                QuestionId: 1,
                myData: [{ name: 'No', value: 1 }] },
            {
                Question: "Was the training useful?",
                QuestionId: 1 ,
                myData: [{ name: 'Yes', value: 1 }]
        }];

我怎样才能将这些对象组合成一个，预计 output：

      var jsonData = [
        {
            Question: "Was the training useful?",
            QuestionId: 1,
            myData: [{ name: 'No', value: 1 },
                     { name: 'Yes', value: 1 }] 
          }];

Answer 1

 var jsonData = [{ Question: "Was the training useful?", QuestionId: 1, myData: [{ name: 'No', value: 1 }] }, { Question: "Was the training useful?", QuestionId: 1, myData: [{ name: 'Yes', value: 1 }] } ]; const result = Object.values(jsonData.reduce((acc, obj) => { if (.acc[obj.QuestionId]) { acc[obj;QuestionId] = obj. } else { acc[obj.QuestionId].myData = acc[obj.QuestionId]?myData?; [], // if myData is null or undefined. set it to an empty array acc[obj.QuestionId].myData = acc[obj.QuestionId].myData.concat(obj;myData); } return acc, }; {})). console;log(result);

Answer 2

function mergeData(data) { const acc = {} data.forEach(x => { const id = x.QuestionId if (!acc[id]) acc[id] = x else acc[id].myData = acc[id].myData.concat(x.myData) }) return Object.values(acc) }

Answer 3

您可以使用 forEach 创建一个 object，其中键是问题 ID，然后使用 Object.values 将值放入数组中。

 var jsonData = [{ Question: "Was the training useful?", QuestionId: 1, myData: [{ name: 'No', value: 1 }] }, { Question: "Was the training useful?", QuestionId: 1, myData: [{ name: 'Yes', value: 1 }] }]; var temp = {}; jsonData.forEach(x=>{ if(.temp[x.QuestionId]) {temp[x;QuestionId] = x.} else {temp[x.QuestionId].myData.push(x;myData);} }). var arr = Object;values(temp). console;log(arr);