是否有可能基于JavaScript中的另一个对象对已排序的数组进行排序？

Question

I am sorting this type of array by genre:

const bands = [ 
  { genre: 'Rap', band: 'Migos', albums: 2},
  { genre: 'Pop', band: 'Coldplay', albums: 4, awards: 10},
  { genre: 'Pop', band: 'xxx', albums: 4, awards: 11},
  { genre: 'Pop', band: 'yyyy', albums: 4, awards: 12},
  { genre: 'Rock', band: 'Breaking zzzz', albums: 1}
  { genre: 'Rock', band: 'Breaking Benjamins', albums: 1}
];

With this:

function compare(a, b) {
  // Use toUpperCase() to ignore character casing
  const genreA = a.genre.toUpperCase();
  const genreB = b.genre.toUpperCase();

  let comparison = 0;
  if (genreA > genreB) {
    comparison = 1;
  } else if (genreA < genreB) {
    comparison = -1;
  }
  return comparison;
}

As describe here But after sorting by genre, I also want to sort it by number of albums.Is it possible? TIA

Answer 1

function compare(a, b) {
// Use toUpperCase() to ignore character casing
const genreA = a.genre.toUpperCase();
const genreB = b.genre.toUpperCase();

return genreA.localeCompare(genreB) || a.albums-
b.albums;
}

I shortified your code to genreA.localeCompare(genreB). If it is 0, the genres are equal, and we'll therefore compare by the number of albums.

This if 0 take ... instead is provided by the OR operator...

Answer 2

Sure, after you are done doing whatever you need to do with the first array. Assuming you don't want to modify your first array, you can make a copy by using slice. Then you can sort by album number. Let me know if this helps

 const bands = [{ genre: 'Rap', band: 'Migos', albums: 2 }, { genre: 'Pop', band: 'Coldplay', albums: 4, awards: 10 }, { genre: 'Pop', band: 'xxx', albums: 4, awards: 11 }, { genre: 'Pop', band: 'yyyy', albums: 4, awards: 12 }, { genre: 'Rock', band: 'Breaking zzzz', albums: 1 }, { genre: 'Rock', band: 'Breaking Benjamins', albums: 1 } ]; var sortedAlbumNumber = bands.slice(); sortedAlbumNumber.sort((a, b) => a['albums'] - b['albums']); console.log(sortedAlbumNumber);