Disclosure
Most of the problems under my TypeHero Challenges folder were either obtained from typehero.dev or from type-challenges repo. Purpose of these articles are just to document my approaches for my easy reference. Please visit the respective links for more info.
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Problem Description
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]Solutions
Approach 1: Using infer
type Pop<T extends any[]> = T extends [...infer Rest, any] ? Rest : [];