按年和月排序数组

Question

我有如下数组,

let  yearAndMonth  =  [
    { "year": 2013, "month": "FEBRUARY" },
    { "year": 2015, "month": "MARCH" },
    { "year": 2013, "month": "JANUARY" },
    { "year": 2015, "month": "FEBRUARY" }
]

我希望按年份排序数组,然后在该年的那个月之后对数组进行排序,

我想要像这样的输出,

yearAndMonth  =  [
    { "year": 2013, "month": "JANUARY " },
    { "year": 2013, "month": "FEBRUARY" },
    { "year": 2015, "month": "FEBRUARY" },
    { "year": 2015, "month": "MARCH" }
]

怎么做到这一点？

Answer 1

您可以采用一个对象来表示月份名称及其数值。

通过获取年和月的增量来链接订单。

var array =  [{ year: 2013, month: "FEBRUARY" }, { year: 2015, month: "MARCH" }, { year: 2013, month: "JANUARY" }, { year: 2015, month: "FEBRUARY" }];

array.sort(function (a, b) {
    var MONTH = { JANUARY: 0, FEBRUARY: 1, MARCH: 2, APRIL: 3, MAY: 4, JUNE: 5, JULY: 6, AUGUST: 7, SEPTEMBER: 8, OCTOBER: 9, NOVEMBER: 10, DECEMBER: 11 };
    return a.year - b.year || MONTH[a.month] - MONTH[b.month];
});

console.log(array);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

您还可以使用lodash库按多列对数据进行排序。

我在Stackblitz上创建了一个演示 。我希望这会对您/其他人有所帮助/指导。

lodash -文档

组件.html

<table width="100%">
  <tr>
    <td>Year</td>
    <td>Month</td>
  </tr>
  <tr *ngFor="let datas of sortedData">
    <td>{{datas.year}}</td>
    <td>{{datas.month}}</td>
  </tr>
</table>

组件.ts

 sortedData: any[];
  data = [
    { "year": 2013, "month": "FEBRUARY" },
    { "year": 2015, "month": "MARCH" },
    { "year": 2013, "month": "JANUARY" },
    { "year": 2013, "month": "MARCH" },
    { "year": 2013, "month": "APRIL" },
    { "year": 2015, "month": "FEBRUARY" }
  ];

monthArray: any = ["JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE",
        "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER"];

  ngOnInit() {
    this.sortedData = _.orderBy(data, [(datas) => datas.year, (user) => (this.monthArray.indexOf(user.month))], ["asc", "asc"]);
    console.log(this.sortedData);
  }