如何按日期合并/分组数组对象的两个值

Question

我正在尝试使用 Amchart Multiple Values 显示图表，信息来自 ElasticSearch。这是我的 JS 代码：

$.get(URI).then(resp => JSON.parse(resp))
            .then(values => {
                console.log(values)
                var data = [],
                values.map(e => e._source) //From Elastic the info is inside '_source' key  
                    .map((n, i) => {
                        n.date = moment(n.date).format('Y-MM-DD');
// I'm trying to format date, because it cames with Hour:Min:Sec and if I 
// try to compare dates it wont be equal (NOT USING IN THIS ATTEMPT)
                        if (n.warehouse.name === 'General') {
                            data.push({date: n.date, general: n.assessment});
                        } else {
                            data.push({date: n.date, intransit: n.assessment});
                        }

                    });

            })
            .fail(err => console.error(err.response));

这是这段代码的输出：

0: {date: "2019-07-10", intransit: 1234.23}
1: {date: "2019-07-10", general: 1234.23}
2: {date: "2019-07-12", intransit: 1234.23}
3: {date: "2019-07-12", general: 1234.23}

如您所见，日期重复，我如何合并/组合两者但又不丢失价值？ 信息必须是这样的：

0: {date: "2019-07-10", intransit: 1234.23, general: 1234.23}
2: {date: "2019-07-12", intransit: 1234.23, general: 1234.23}

如果您无法从 Elastic 中可视化结构，这是 console.log(values) 的输出：

_source: {date: "2019-07-10", assessment: 123.12, 
warehouse: {id: 1, name: "General"}

我尝试过使用 Lodash/UnderscoreJS、循环等...但什么也没有。如果您对此有任何建议或任何信息，将不胜感激。 谢谢。

Answer 1

使用 reduce() 创建 groupBy 对象或使用日期作为键的 Map 然后返回 values

const data = [ {date: "2019-07-10", intransit: 1234.23}, {date: "2019-07-10", general:1234.23}, {date: "2019-07-12", intransit: 1234.23},{date: "2019-07-12", general:1234.23}]

const res = Object.values(
  data.reduce((a, c) => {
    a[c.date] = a[c.date] || {};
    Object.assign(a[c.date], c);
    return a;
  }, {})
)


console.log(res)

Answer 2

这里是基于Lodash-fp的解决方案

const dateMerger = _.flow([
    _.groupBy('date'),
    _.values,
    _.map(_.reduce(_.merge, {}))
]);

const dateData = [
    {date: "2019-07-10", intransit: 1234.23},
    {date: "2019-07-10", general: 1234.23},
    {date: "2019-07-12", intransit: 1234.23},
    {date: "2019-07-12", general: 1234.23}
];

console.log(dateMerger(dateData));