run the following code: var grade = [1, 2, 3, 4, 5]; var name = [a, b, c, d, e]; var name2= ['a', 'b', 'c',

run the following code:

1. In the first output after swap, please explain the number sequence changes.

2. In the second output after swap, please explain the no changes of the letter sequence.

3. In the third output after swap, please explain the changes of the letter sequence.

4. In the fourth output after swap, please explain the changes of the letter sequence.