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Combination

提出詳細

type CombinationImpl<T extends string, TT extends string=T> =
  T extends T
  ? [TT] extends [T]
    ? T
    : T | `${T} ${CombinationImpl<Exclude<TT,T>>}`
  : never
type Combination<T extends string[]> = CombinationImpl<T[number]>
提出日時2023-09-18 13:30:22
問題Combination
ユーザーsankantsu
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<Combination<['foo', 'bar', 'baz']>,
  'foo' | 'bar' | 'baz' | 'foo bar' | 'foo bar baz' | 'foo baz' | 'foo baz bar' | 'bar foo' | 'bar foo baz' | 'bar baz' | 'bar baz foo' | 'baz foo' | 'baz foo bar' | 'baz bar' | 'baz bar foo'>>,
]