understanding bubble sort algorithm in js code example

Example 1: bubble sort javascript

bubbleSort(Array) {
    let len = Array.length;
    for (let i = 0; i < len; i++) { //you can also use "for in", so you don't need the variable "len"
        for (let j = 0; j < len; j++) {
            if (Array[j] > Array[j + 1]) {
                let tmp = Array[j];
                Array[j] = Array[j + 1];
                Array[j + 1] = tmp;
            }
        }
    }
    return Array;
};

Example 2: javascript bubble sort

const bubbleSort = (arr) => {
  for (let i = 0; i < arr.length; i++) {
    for (let j = 0; j < arr.length - i; j++) {
      if (arr[j] > arr[j + 1]) {
        let tmp = arr[j];
        arr[j] = arr[j + 1];
        arr[j + 1] = tmp;
      }
    }
  }
  return arr;
}