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
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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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