Return Last Item

Create a function that returns the last value of the last item in an array or string.

Examples

lastItem([0, 4, 19, 34, 50, -9, 2]) ➞ 2

lastItem("The quick brown fox jumped over the lazy dog") ➞ "g"

lastItem([]) ➞ undefined

Notes

• Arrays/strings will be of varying size.
• Return undefined if array/string is empty.