// bubble sort in javascript

Array.prototype.bubbleSort = function(callback = (a, b) => a > b) {
    const array = this;
    for (let i = 0; i < array.length; i++) {
        let swaps = 0;
        for (let j = 0; j < array.length - i - 1; j++) {
            if (callback(array[j], array[j + 1])) {
                let temp = array[j];
                array[j] = array[j + 1];
                array[j + 1] = temp;
                swaps ++;
            }
        }
        if (swaps === 0) break;
    }
}

const array = [21, 1, 2, 6, 10, 12, 10, 21, 5, 9, 0];
// a > b for sorting in ascending order 
// a < b for descending
array.bubbleSort((a, b) => a > b);
console.log(array);