按日期对 desc 进行排序，如果并列则按 javascript 数组中的风险排序答案

【问题标题】：Sort desc on date and if tie then on risk in javascript array按日期对 desc 进行排序，如果并列则按 javascript 数组中的风险排序
【发布时间】：2021-01-14 01:48:37
【问题描述】：

我有一组对象，我想先按日期排序，即 desc 中的“create_date_format”，如果 tie 然后按字母顺序排序风险，即 asc

我试过 lodash.orderBy(risk_list, ['create_date_format', 'risk'], ['desc']) 但由于日期是字符串格式，它按日期字符串中的数字排序，因此例如 2020 年 1 月 28 日出现在 01 之前2020 年 8 月，因为 28 比 01 高。

let arr = [{
  avoided: 0,
  avoided_note: null,
  create_date_format: "28 Sep 2020",
  id: 209,
  notes: "Nothing is happening",
  risk: "very high risk",
  severity: 3,
  severity_name: "High",
  type: 1,
  type_name: "Internal"
}, {
  avoided: 0,
  avoided_note: null,
  create_date_format: "23 Sep 2020",
  id: 206,
  notes: null,
  risk: "Risk 12",
  severity: 3,
  severity_name: "High",
  type: 2,
  type_name: "External"
}, {
  avoided: 0,
  avoided_note: null,
  create_date_format: "22 Sep 2020",
  id: 202,
  notes: "test note",
  risk: "test risk",
  severity: 3,
  severity_name: "High",
  type: 2,
  type_name: "External"
}, { 
  avoided: 0,
  avoided_note: null,
  create_date_format: "23 Sep 2020",
  id: 206,
  notes: null,
  risk: "abc Risk 12",
  severity: 3,
  severity_name: "High",
  type: 2,
  type_name: "External"
}]

我想首先按日期排序，即 desc 中的“create_date_format”，如果并列，则按字母顺序在 asc 中的“风险”上排序

【问题讨论】：

你不需要像lodash这样的外部库；你所需要的只是Array.prototype.sort() (developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…)，如果你想根据两个条件进行排序，你可以做类似arr.sort((a, b) => return [sorting condition 1] || [sorting condition 2])
这应该会有所帮助：stackoverflow.com/questions/10123953/…

标签： javascript node.js arrays reactjs sorting

【解决方案1】：

let sorted = arr.sort((a, b) =>
  // sort by create_date_format desc
  (new Date(b.create_date_format) - new Date(a.create_date_format)) 
  // if 0 (tie), sort by risk asc
  || a.risk.localeCompare(b.risk) 
)

【讨论】：

【解决方案2】：

您可以做的是编写一个排序函数，它可以简单地检查比较属性。为了首先按日期排序，您需要将字符串日期转换为Date 实例，以便按时间而不是按字符对值进行排序。

为要比较的两个对象创建日期实例后，您可以检查两个日期项是否相等。如果是，则跳过此排序逻辑并根据risk 执行排序。看sn-p

let arr = [{avoided: 0,
avoided_note: null,
create_date_format: "28 Sep 2020",
id: 209,
notes: "Nothing is happening",
risk: "very high risk",
severity: 3,
severity_name: "High",
type: 1,
type_name: "Internal"}, 
{ avoided: 0,
avoided_note: null,
create_date_format: "23 Sep 2020",
id: 206,
notes: null,
risk: "Risk 12",
severity: 3,
severity_name: "High",
type: 2,
type_name: "External"}, {avoided: 0,
avoided_note: null,
create_date_format: "22 Sep 2020",
id: 202,
notes: "test note",
risk: "test risk",
severity: 3,
severity_name: "High",
type: 2,
type_name: "External"}, 
{ avoided: 0,
avoided_note: null,
create_date_format: "23 Sep 2020",
id: 206,
notes: null,
risk: "abc Risk 12",
severity: 3,
severity_name: "High",
type: 2,
type_name: "External"}]

var sortedArr = arr.sort((a, b)=>{
  var aDate = new Date(a.create_date_format)
  var bDate = new Date(b.create_date_format)

  if (aDate.getTime() === bDate.getTime()){
    //for strings return 1 or -1 depending on condition
    return b.risk > a.risk ? 1 : -1
  } else {
    return aDate - bDate
  }
})

console.log(sortedArr)

【讨论】：