CODEWITHSUNDEEP
javascript
art12345
art12345

Reputation: 59

Sorting in particular manner rather than Ascending or descending

I am using javascript sort method. I want to sort the doc_requirement key of items in order 1,4,3,0 But the order I am getting is 4,3,1,0 . How to achieve a particular order rather than sorting in ascending or descending manner?

var items = [
  { doc_requirement :4},
  { doc_requirement: 3 },
  { doc_requirement:3  },
  {doc_requirement: 0 },
  { doc_requirement: 1 },
  { doc_requirement: 3 }
];

items.sort(function(firstDoc, secondDoc) {
if(firstDoc.doc_requirement < secondDoc.doc_requirement){
                        return true;
                    } else if(firstDoc.doc_requirement == secondDoc.doc_requirement){
                        return true;
                    } else{
                        return false;
                    }
});

Output expected

var items =[ { doc_requirement: 1 },
      { doc_requirement: 4 },
      { doc_requirement: 3 },
      { doc_requirement: 3 },
      { doc_requirement: 3 },
      { doc_requirement: 0 } ]

Upvotes: 0

Views: 44

Answers (1)

Oneiros
Oneiros

Reputation: 4378

Your sort function should return integers, not booleans (Source: Array.prototype.sort()). It should look like this: 

function compare(a, b) {
  if (a is less than b by some ordering criterion) {
    return -1;
  }
  if (a is greater than b by the ordering criterion) {
    return 1;
  }
  // a must be equal to b
  return 0;
}

In your case, you could use this:

function compare(a, b) {
   var order = [1, 4, 3, 0];
   var i1 = order.indexOf(a.doc_requirement);
   var i2 = order.indexOf(b.doc_requirement);
   return i1 - i2;
}

Upvotes: 3

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