Do you know lodash? Chunk is a very useful function in it, now let's implement it. Chunk<T, N> accepts two required type parameters, the T must be a tuple, and the N must be an integer >=1
type exp1 = Chunk<[1, 2, 3], 2> // expected to be [[1, 2], [3]] type exp2 = Chunk<[1, 2, 3], 4> // expected to be [[1, 2, 3]] type exp3 = Chunk<[1, 2, 3], 1> // expected to be [[1], [2], [3]]
/* _____________ Your Code Here _____________ */
type Chunk<T extends any[], U extends number, ACC extends any[]= []> = ACC['length'] extends U
? [ACC, ...Chunk<T, U>]
: T extends [infer F, ...infer RT]
? Chunk<RT, U, [...ACC, F]>
: ACC['length'] extends 0
? []
: [ACC];
/* _____________ Test Cases _____________ */
import type { Equal, Expect } from '@type-challenges/utils'
type cases = [
Expect<Equal<Chunk<[], 1>, []>>,
Expect<Equal<Chunk<[1, 2, 3], 1>, [[1], [2], [3]]>>,
Expect<Equal<Chunk<[1, 2, 3], 2>, [[1, 2], [3]]>>,
Expect<Equal<Chunk<[1, 2, 3, 4], 2>, [[1, 2], [3, 4]]>>,
Expect<Equal<Chunk<[1, 2, 3, 4], 5>, [[1, 2, 3, 4]]>>,
Expect<Equal<Chunk<[1, true, 2, false], 2>, [[1, true], [2, false]]>>,
]
标签：ACC,Typescript,_____________,Chunk,Medium,extends,Expect,type From： https://www.cnblogs.com/Answer1215/p/16823663.html