Sort an array of objects by multiple properties

Question

I have an array of objects like this:

var a = [
    { id: 1, score: 1, isCut: false, dnf: false },
    { id: 2, score: 2, isCut: false, dnf: false },
    { id: 3, score: 3, isCut: false, dnf: false },
    { id: 4, score: 4, isCut: false, dnf: false },
    { id: 5, score: 5, isCut: true, dnf: true },
    { id: 6, score: 6, isCut: true, dnf: false },
    { id: 7, score: 7, isCut: true, dnf: false },
    { id: 8, score: 8, isCut: true, dnf: false },
    { id: 9, score: 9, isCut: true, dnf: false },
    { id: 10, score: 0, isCut: false, dnf: false },
    { id: 11, score: -1, isCut: false, dnf: false },
    { id: 12, score: -2, isCut: false, dnf: true },
    { id: 13, score: -3, isCut: false, dnf: false },
    { id: 14, score: -4, isCut: false, dnf: false },
    { id: 15, score: -5, isCut: false, dnf: false },
    { id: 16, score: 10, isCut: true, dnf: false }
];

I need to group and sort the array by the following criteria:

1. if dnf is true, object goes to bottom; all dnf-objects should be sorted by score
2. if isCut is true, object goes to bottom, but above dnfs; all isCut-objects should be sorted by score
3. rest should be sorted by score, and if the scores are equal, by id

Solution

(Updated) Here's the answer of question you mentioned in comment.

a.sort(function(a, b) {
  if (a.dnf != b.dnf) {
    return a.dnf ? 1 : -1;
  }
  if (!(a.dnf && b.dnf) && a.isCut != b.isCut) {
    return a.isCut ? 1 : -1;
  }
  if (a.score != b.score) {
    return b.score - a.score; // descending
  }
  return b.id - a.id; // descending
});

Result:

[
  {"id":4,"score":4,"isCut":false,"dnf":false},   // the rest: order by score, id
  {"id":3,"score":3,"isCut":false,"dnf":false},   //
  {"id":2,"score":2,"isCut":false,"dnf":false},   //
  {"id":1,"score":1,"isCut":false,"dnf":false},   //
  {"id":10,"score":0,"isCut":false,"dnf":false},  //
  {"id":11,"score":-1,"isCut":false,"dnf":false}, //
  {"id":13,"score":-3,"isCut":false,"dnf":false}, //
  {"id":14,"score":-4,"isCut":false,"dnf":false}, //
  {"id":15,"score":-5,"isCut":false,"dnf":false}, //
  {"id":16,"score":10,"isCut":true,"dnf":false}, // isCut: order by score, id
  {"id":9,"score":9,"isCut":true,"dnf":false},   //
  {"id":8,"score":8,"isCut":true,"dnf":false},   //
  {"id":7,"score":7,"isCut":true,"dnf":false},   //
  {"id":6,"score":6,"isCut":true,"dnf":false},   //
  {"id":5,"score":5,"isCut":true,"dnf":true},   // dnf: order by score, id
  {"id":12,"score":-2,"isCut":false,"dnf":true} //
]