Getting item in array is as simple as calling
array[index] for example
array. You can use same principle to get last item in array. Let's say you have array similar to this.
const array = ['first', 'second', 'third', 'fourth', 'fifth']
To get last item you'll just pass
array.length (5 for array above) and subtract 1 from it because arrays are zero based (they start counting from 0 instead of 1).
const last = array[array.length - 1] // 'fifth'