Refer: Medium - Absolute

Describe

Implement the Absolute type. A type that take string, number or bigint. The output should be a positive number string

For example

code snippetCopytypescript
type Test = -100
type Result = Absolute<Test> // expected to be "100"

Test Cases

code snippetCopytypescript
import { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<Absolute<0>, '0'>>,
  Expect<Equal<Absolute<-0>, '0'>>,
  Expect<Equal<Absolute<10>, '10'>>,
  Expect<Equal<Absolute<-5>, '5'>>,
  Expect<Equal<Absolute<'0'>, '0'>>,
  Expect<Equal<Absolute<'-0'>, '0'>>,
  Expect<Equal<Absolute<'10'>, '10'>>,
  Expect<Equal<Absolute<'-5'>, '5'>>,
  Expect<Equal<Absolute<-1_000_000n>, '1000000'>>,
  Expect<Equal<Absolute<9_999n>, '9999'>>,
]

Solution

code snippetCopytypescript
type Absolute<T extends number | string | bigint> = `${T}` extends `${'-'}${infer K}` ? K : `${T}`