使用 .reduce() 将数组转换为对象

Question

我正在尝试研究Array.reduce 。 我被赋予了以下任务：

输入数据：

const report = [
  {
    dateOfReport: "11-01-2021",
    userId: "id1",
    userMetric: { first_metric: 10, second_metric: 15 },
  },
  {
    dateOfReport: "11-01-2021",
    userId: "id2",
    userMetric: { first_metric: 9, second_metric: 14 },
  },
  {
    dateOfReport: "12-01-2021",
    userId: "id1",
    userMetric: { first_metric: 11, second_metric: 14 },
  },
  {
    dateOfReport: "12-01-2021",
    userId: "id2",
    userMetric: { first_metric: 16, second_metric: 19 },
  },
];

我需要在输出中获取这些数据

const output = [
  {
    dateOfReport: "11-01-2021",
    id1: { first_metric: 10, second_metric: 15 },
    id2: { first_metric: 9, second_metric: 14 },
  },
  {
    dateOfReport: "12-01-2021",
    id1: { first_metric: 11, second_metric: 14 },
    id2: { first_metric: 16, second_metric: 19 },
  },
];

我试图写一些代码，但我不知道如何正确地做到这一点。 我怎么解决这个问题？

代码：

 const result = report.reduce((acc, dataItem) => {
    let outputArray = [];

    if (dataItem) {
      outputArray.push({ ...dataItem, date: dataItem.dateOfReport, [dataItem.userId]: dataItem.userMetric });
    }

    return outputArray;
  });

  return result;

Answer 1

更正了逻辑

 const report = [ { dateOfReport: "11-01-2021", userId: "id1", userMetric: { first_metric: 10, second_metric: 15 }, }, { dateOfReport: "11-01-2021", userId: "id2", userMetric: { first_metric: 9, second_metric: 14 }, }, { dateOfReport: "12-01-2021", userId: "id1", userMetric: { first_metric: 11, second_metric: 14 }, }, { dateOfReport: "12-01-2021", userId: "id2", userMetric: { first_metric: 16, second_metric: 19 }, }, ]; const result = report.reduce((acc, dataItem) => { const node = acc.find(item => item.dateOfReport === dataItem.dateOfReport); if (node) { node[dataItem.userId] = dataItem.userMetric; } else { acc.push({ dateOfReport: dataItem.dateOfReport, [dataItem.userId]: dataItem.userMetric }); } return acc; }, []); console.log(result);