The length of an array is found
using the property
let arr = ['a', 'b', 'c']; console.log(arr.length) // shows 'c'
If you know the length of an array, you can get its last element:
let arr = [1, 2, 3]; console.log(arr[arr.length - 1]) // shows 3
Create an array with arbitrary elements. Display on the screen the number of elements in this array.
Create an array with arbitrary elements. Display the last element of this array.