CODEWITHSUNDEEP
javascriptarrayssorting
pavlos
pavlos

Reputation: 27

Js Custom sorting

I'm trying to sort array of strings ['d', 'CC', 'BB', 'b', 'a', 'Am','AMG'] in such order ["AMG", "Am", "a", "BB", "b", "CC", "d"]

Using 

arr.sort(function (a, b) {
  return a.toLowerCase().localeCompare(b.toLowerCase());
});

I get ["a", "Am", "AMG", "b", "BB", "CC", "d"]

Upvotes: 1

Views: 76

Answers (1)

Nina Scholz
Nina Scholz

Reputation: 386600

You could chain some sort criteria, after swapping the case of the letters, then

  • sort by first lower case characters ascending,
  • sort by length descending
  • sort by string ascending

function swap(s) {
    return Array.from(s, c => c.toUpperCase() === c ? c.toLowerCase() : c.toUpperCase()).join('');
}

var array = ['d', 'CC', 'BB', 'b', 'bb', 'a', 'Am', 'AMG'];

array.sort((a, b) => {
    var aa = swap(a),
        bb = swap(b);

   return a[0].toLowerCase().localeCompare(b[0].toLowerCase())
       || bb.length - aa.length
       || aa.localeCompare(bb);
});

console.log(array); // ["AMG", "Am", "a", "BB", "b", "CC", "d"]

Upvotes: 2

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