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Combination

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type Combination<T extends string[], U extends string = T[number]> = 
[U] extends [never] ? never : U | {
  [K in U]: `${K} ${Combination<Exclude<T[number], K>[]>}`
}[U]
提出日時2025-09-23 15:53:08
問題Combination
ユーザーbalckowl
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'>>,
]