按日期对 desc 进行排序，如果匹配则在 javascript 数组中进行风险排序

Question

I've array of objects which i want to sort first on date ie, 'create_date_format' in desc & if tie then sort on risk alphabetically ie, asc

I tried lodash.orderBy(risk_list, ['create_date_format', 'risk'], ['desc']) but as date is in string format it sorted on numbers in date string so for eg 28 jan 2020 appears before 01 aug 2020 as 28 is higher than 01.

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"
}]

I want to sort first on date ie, 'create_date_format' in desc and if tie then on 'risk' alphabetically in asc

Answer 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) 
)

Answer 2

What you can do is write a sort function that has a simple check for comparing properties. In order to sort by date first, you'll need to convert the string date into a Date instance in order to sort the values by time as opposed to by char.

After you create a date instance for the two objects you're comparing, you can check if the two date items are equal. If they are, then skip this sort logic and execute a sort based on risk . See the snippet

 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)