04-first-of-array.ts

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

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

type First<T extends any[]> = T[0]

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