1

I have an array of objects with two keys:

  1. Score
  2. Date

I need to sort the array in reverse order, from highest to lowest. I have this code to sort the array by score:

highscores.sort(function(a, b) {
  return b.score - a.score;
});

I'd like to sort it by date also if the score values are equals, i.e.

Array = [
  {score: 200, date: 11/11/2016}, 
  {score: 300, date: 11/11/2016}, 
  {score: 200, date: 12/11/2016}
];

I expect this result:

Array = [
  {score: 300, date: 11/11/2016},
  {score: 200, date: 12/11/2016},
  {score: 200, date: 11/11/2016}       
];
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9
  • 1
    This answer may provide a simpler, more to-the-point solution Commented Nov 22, 2016 at 2:47
  • You can check my answer below which is simply using getTime method Commented Nov 22, 2016 at 2:50
  • @RuslanOsmanov I checked that answer but was so complicated to implement. Thank you anyway :) Commented Nov 22, 2016 at 2:54
  • @qxz Thanks for the link. :) Commented Nov 22, 2016 at 2:55
  • 1
    @Aruna Yep, that was what I was looking for. It's perfect. Just need a and b variables in the date part. d.date - a.date and runs perfect. Thank you. :) Commented Nov 22, 2016 at 2:57

2 Answers 2

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3

Here you go,

You can further sort by date if the difference between the score equals 0.

You can simply subtract the date as below.

var highscores = [
  {score: 200, date: '11/11/2016'}, 
  {score: 300, date: '11/11/2016'}, 
  {score: 200, date: '12/11/2016'}
];

highscores.sort(function(a, b) {
  var c = b.score - a.score;
  return c === 0 ? new Date(b.date).getTime() - new Date(a.date).getTime() : c; // Even you can use without 'getTime' since the '-' operator implicitly do this
});

console.log(highscores);

Note: Date conversion inside the sort method is to make the sample to work. Instead actual object array should have the date object

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10 Comments

you have to change your data compare, in down order.
@KrisRoofe Thanks and I have corrected this.
Note that you don't need the .getTime(), because the - operator implicitly converts its operands to numbers first.
How can I delete the [duplicate] tag from my post, I saw the answer of that question and is not the same. It's a horrible implementation that answer. I could do that by myself for solve this but I wanted this short one.
@Aruna Yep, unfortunately we're more bad programmers than good ones. XD But someday I'd help when I learn more.
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0

Keep dates in string format for conversion, Example snippet

var arr = [{
  score: 200,
  date: "11/11/2016"
}, {
  score: 300,
  date: "11/11/2016"
}, {
  score: 200,
  date: "12/11/2016"
}];

var c = arr.sort(predictsort());
console.log(c);

function predictsort() {
  sorter = function(c, d, key) {
    return key === "score" ? d[key] - c[key] : new Date(d[key]) - new Date(c[key]);
  }
  return function(a, b) {
    return sorter(a, b, "score") === 0 ? sorter(a, b, "date") : sorter(a, b, "score")
  }
}

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2 Comments

Thanks buddy for the help. ;)
no problem at all.

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