[Typescript] 22. Medium - Pop

TypeScript 4.0 is recommended in this challenge

Implement a generic Pop<T> that takes an Array T and returns an Array without it's last element.

For example

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

type re1 = Pop<arr1> // expected to be ['a', 'b', 'c']
type re2 = Pop<arr2> // expected to be [3, 2]

Extra: Similarly, can you implement Shift, Push and Unshift as well?

 

/* _____________ Your Code Here _____________ */

type Pop<T extends any[]> = T extends [...(infer RT), infer Last] ? RT: never


/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<Pop<[3, 2, 1]>, [3, 2]>>,
  Expect<Equal<Pop<['a', 'b', 'c', 'd']>, ['a', 'b', 'c']>>,
]