type-challenges/questions/14-easy-head

Head of Array

by Anthony Fu @antfu

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

For example

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

type head1 = Head<arr1> // expected to be 'a'
type head2 = Head<arr2> // expected to be 3