Bubble sort implementation in JavaScript

bubble-sort-javascript.js

/**
 * Sort an array in ascending order.
 * Delete null values before output.
 * @param {number[]} array
 * @return {number[]}
 */
function bubbleSort (array) {
  var count = 0
  var length = array.length

  // traverse the array (length of array) times
  while (count !== length) {
    for (var i = length; i > count; i--) {
      var current = array[i]
      var left = array[i - 1]

      // delete element if value is null
      if (current === null) {
        array.splice(i, 1)
        continue
      }

      // swap
      if (left !== undefined && left > current) {
        array[i - 1] = current
        array[i] = left
      }
    }
    count++
  }
  return array
}

// test with positive numbers only
console.log(bubbleSort([109, 90, 44, 39, 4, 24, 2, 0, 10]))
// => [ 0, 2, 4, 10, 24, 39, 44, 90, 109 ]

// test with negative numbers
console.log(bubbleSort([10, 9, 8, 7, 6, 4, 5, 3, 2, 1, 0, -1, -3, -2]))
// => [ -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ]

// test with null values
console.log(bubbleSort([3, 8, 1, 33, 0, null, 2, 7, 3, null, 4, 6]))
// => [ 0, 1, 2, 3, 3, 4, 6, 7, 8, 33 ]