00011-easy-tuple-to-object.ts

/*
  11 - Tuple to Object
  -------
  by sinoon (@sinoon) #easy

  ### Question

  Give an array, transform into an object type and the key/value must in the given array.

  For example

  ```ts
  const tuple = ['tesla', 'model 3', 'model X', 'model Y'] as const

  type result = TupleToObject<typeof tuple> // expected { tesla: 'tesla', 'model 3': 'model 3', 'model X': 'model X', 'model Y': 'model Y'}
  ```

  > View on GitHub: https://tsch.js.org/11
*/

/* _____________ Your Code Here _____________ */

type TupleToObject<T extends readonly any[]> = { [K in T[number]]: K }

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

const tuple = ['tesla', 'model 3', 'model X', 'model Y'] as const
const tupleNumber = [1, 2, 3, 4] as const
const tupleMix = [1, '2', 3, '4'] as const

type cases = [
  Expect<
    Equal<
      TupleToObject<typeof tuple>,
      {
        tesla: 'tesla'
        'model 3': 'model 3'
        'model X': 'model X'
        'model Y': 'model Y'
      }
    >
  >,
  Expect<Equal<TupleToObject<typeof tupleNumber>, { 1: 1; 2: 2; 3: 3; 4: 4 }>>,
  Expect<
    Equal<TupleToObject<typeof tupleMix>, { 1: 1; '2': '2'; 3: 3; '4': '4' }>
  >
]

// @ts-ignore @ts-expect-error
type error = TupleToObject<[[1, 2], {}]>

/* _____________ Further Steps _____________ */
/*
  > Share your solutions: https://tsch.js.org/11/answer
  > View solutions: https://tsch.js.org/11/solutions
  > More Challenges: https://tsch.js.org
*/