JS按数组中月份日期值(对象)分组 [英] JS group by month of date values (objects) in an array

问题描述

我的数组是这样的:

myArray = [
  {date: "2017-01-01", num: "2"}
  {date: "2017-01-02", num: "3"}
  {date: "2017-02-04", num: "6"}
  {date: "2017-02-05", num: "15"}
]

我想将其转换为:

myArray = [
   {group: "0", data: [
      {date: "2017-01-01", num: "2"}
      {date: "2017-01-02", num: "3"}]
   },
   {group: "1", data: [  
      {date: "2017-02-04", num: "6"}
      {date: "2017-02-05", num: "15"}]
   },
]

基本上，按月日期键分组.

Basically, group by month of date key.

推荐答案

使用 Array.prototype.reduce ， String.prototype.split 和 Array的解决方案.prototype.map 函数:

var myArray = [
    {date: "2017-01-01", num: "2"},
    {date: "2017-01-02", num: "3"},
    {date: "2017-02-04", num: "6"},
    {date: "2017-02-05", num: "15"}
],
    groupKey = 0;
    groups = myArray.reduce(function (r, o) {
        var m = o.date.split(('-'))[1];
        (r[m])? r[m].data.push(o) : r[m] = {group: String(groupKey++), data: [o]};
        return r;
    }, {});

var result = Object.keys(groups).map(function(k){ return groups[k]; });

console.log(result);

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