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Take Elements

约 182 字小于 1 分钟

2026-02-11

题目

Implement a type Take<N, Arr> that returns the first N elements from an array Arr. If N is negative, return the last |N| elements

For example,

type T0 = Take<2, [1, 2, 3]> // [1, 2]
type T1 = Take<3, ['1', 2, true, false]> // ['1', 2, true]
type T2 = Take<-2, [1, 2, 3]> // [2, 3]
type T3 = Take<0, [1, 2, 3]> // []
type T4 = Take<5, [1, 2, 3]> // [1, 2, 3]
type T5 = Take<3, []> // []

解题思路

待补充

答案

type Take<N, Arr> = Arr

验证

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

type cases = [
  Expect<Equal<Take<2, [1, 2, 3]>, [1, 2]>>,
  Expect<Equal<Take<3, ['1', 2, true, false]>, ['1', 2, true]>>,
  Expect<Equal<Take<-2, [1, 2, 3]>, [2, 3]>>,
  Expect<Equal<Take<0, [1, 2, 3]>, []>>,
  Expect<Equal<Take<5, [1, 2, 3]>, [1, 2, 3]>>,
  Expect<Equal<Take<3, []>, []>>,
]

参考

无