1bubbleSort(Array) {
2    let len = Array.length;
3    for (let i = 0; i < len; i++) { //you can also use "for in", so you don't need the variable "len"
4        for (let j = 0; j < len; j++) {
5            if (Array[j] > Array[j + 1]) {
6                let tmp = Array[j];
7                Array[j] = Array[j + 1];
8                Array[j + 1] = tmp;
9            }
10        }
11    }
12    return Array;
13};

1const bubbleSort = array => {
2  const arr = Array.from(array); // avoid side effects
3  for (let i = 1; i < arr.length; i++) {
4    for (let j = 0; j < arr.length - i; j++) { // starts up to length - 1
5      if (arr[j] > arr[j + 1]) {
6        [arr[j], arr[j + 1]] = [arr[j + 1], arr[j]];
7      }
8    }
9  }
10  return arr;
11};
12
13console.log(bubbleSort([4, 9, 2, 1, 5]));
14

1const bubbleSort = (arr) => {
2  for (let i = 0; i < arr.length; i++) {
3    for (let j = 0; j < arr.length - i; j++) {
4      if (arr[j] > arr[j + 1]) {
5        let tmp = arr[j];
6        arr[j] = arr[j + 1];
7        arr[j + 1] = tmp;
8      }
9    }
10  }
11  return arr;
12}

1function bubblesort(array) {
2    len = array.length;
3
4    for (let i = 0; i < len; i++) {
5        for (let j = 0; j < len - i; j++) {
6            let a = array[j];
7            if (a != array[-1]) {
8                var b = array[j + 1];
9                if (a > b) {
10                    array[j] = b;
11                    array[j + 1] = a;
12                }
13            }
14        }
15    }
16}
17
18let array = [10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
19bubblesort(array);
20console.log(array)

1function BubbleSort(arr) {
2      const sortedArray = Array.from(arr);
3      let swap;
4      do {
5        swap = false;
6        for (let i = 1; i < sortedArray.length; ++i) {
7          if (sortedArray[i - 1] > sortedArray[i]) {
8            [sortedArray[i], sortedArray[i - 1]] = [sortedArray[i - 1], sortedArray[i]];
9            swap = true;
10          }
11        }
12      } while (swap)
13      return sortedArray;
14    }
15
16    console.log(BubbleSort([7,99,1,88,34,2,90,7]));

1function bubbleSort(array) {
2  const len = array.length;
3  const retArray = array;
4  for (let i = 0; i < len; i++) {
5    for (let j = 0; j < len - i; j++) {
6      const a = array[j];
7      if (a !== array[-1]) {
8        const b = array[j + 1];
9        if (a > b) {
10          retArray[j] = b;
11          retArray[j + 1] = a;
12        }
13      }
14    }
15  }
16  return retArray;
17}
18bubbleSort([10, 9, 8, 7, 6, 5, 4, 3, 2, 1]);