type-challenges/questions/15-medium-tail

Tail of Array

by Anthony Fu @antfu

TypeScript 4.0 is recommended in this challenge

Implement a generic Tail<T> that takes an Array T and returns it's last element's type.

For example

type arr1 = ['a', 'b', 'c']
type arr2 = [3, 2, 1]

type tail1 = Tail<arr1> // expected to be 'c'
type tail2 = Tail<arr2> // expected to be 1