sorting javascript array on date

Question

hello friends I have a javascript array and I want to sort it on the date from most recent to old. The sort function isn't working I am not sure what I am doing wrong... Anyone can help me? Many thanks in advance!

[Object, Object, Object, Object, Object]
 0 : Object
 favoriteTimestamp : Object
  date : "2016-09-30 10:45:13.000000"
  timezone : "Europe/Brussels"
  timezone_type : 3

Here is my sort function:

console.log(results);

let sortedResults = results.sort(function(a, b) {
      a.favoriteTimestamp.date - b.favoriteTimestamp.date;
 });

console.log(sortedResults);

Both logs give same output so the sort isn't working :'(

Thanks for any help :)

(a,b) => (new Date(b.favoriteTimestamp.date)).getTime() - (new Date(a.favoriteTimestamp.date)).getTime() — Redu
– Redu, Commented Sep 30, 2016 at 9:09
@Redu I am sorry but I don't understand your answer, is it what I have to put in the return of the sort function? — Frank Lucas
– Frank Lucas, Commented Sep 30, 2016 at 9:11
No that is the sort function's callback. In complete it is like results.sort((a,b) => (new Date(b.favoriteTimestamp.date)).getTime() - (new Date(a.favoriteTimestamp.date)).getTime()); — Redu
– Redu, Commented Sep 30, 2016 at 9:12

Anton Chukanov · Accepted Answer · 2016-09-30 09:10:52Z

1

Sort has to return something.

results.sort(function(a, b) {
      return a.favoriteTimestamp.date - b.favoriteTimestamp.date;
});

In your case will be returned NaN, cuz you're trying to substract string from string.

edited Sep 30, 2016 at 9:10

answered Sep 30, 2016 at 9:06

Anton Chukanov

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1 Comment

Nina Scholz Over a year ago

the original callback returns something ... always undefined.

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