array sort not working javascript code example

Example 1: why sort is not working in javascript

function sort() {
        var ary = [2, 1, 0.4, 2, 0.4, 0.2, 1.5, 1, 1.1, 1.3, 1.2, 0.2, 0.4, 0.9];
        return ary.sort(function(a, b) {
          console.log(a,b,'rererererer')
          return a - b;
        });
}
    
alert(sort());

Example 2: how to sort array without using sort method in javascript

function bubbleSort(array) {
  var done = false;
  while (!done) {
    done = true;
    for (var i = 1; i < array.length; i += 1) {
      if (array[i - 1] > array[i]) {
        done = false;
        var tmp = array[i - 1];
        array[i - 1] = array[i];
        array[i] = tmp;
      }
    }
  }

  return array;
}

var numbers = [12, 10, 15, 11, 14, 13, 16];
bubbleSort(numbers);
console.log(numbers);