Zipping Up an Array

Two arrays are part of the same zipper if the ending is identical. The identical section can be thought of as being "zipped-up". Below, [2, 2, 4] is "zipped-up".

Array 1: [3, 5, 8, 9, 2, 2, 4]
Array 2: [1, 7, 2, 2, 4]

Create a function that takes in two arrays. Return false if none of the array is "zipped." Return true if the arrays are identical. Otherwise, return an array with the first index in each array where the zipper diverges.

To illustrate:

zipper([3, 5, 8, 9, 2, 2, 4], [1, 7, 2, 2, 4]) ➞ [3, 1]
// Zipper 1: 9 (index-3) is first element to diverge.
// Zipper 2: 7 (index-1) is first element to diverge.

Examples

zipper([5, 5, 7, 8, 9, 1, 2], [3, 2, 1, 1, 6, 6, 6, 6, 1, 2]) ➞ [4, 7]

zipper([5, 4, 3, 2, 6], [6, 4, 3, 2, 6]) ➞ [0, 0]

zipper([5, 4, 3, 2, 7], [6, 4, 3, 2, 6]) ➞ false

zipper([5, 4, 3, 2, 6], [5, 4, 3, 2, 6]) ➞ true

Notes

Use zero-indexing for the arrays.