[Typescript Challenges] 5. Easy - Length of Tuple
2022/9/2 6:22:58
本文主要是介绍[Typescript Challenges] 5. Easy - Length of Tuple,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
For given a tuple, you need create a generic Length
, pick the length of the tuple
For example:
type tesla = ['tesla', 'model 3', 'model X', 'model Y'] type spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT'] type teslaLength = Length<tesla> // expected 4 type spaceXLength = Length<spaceX> // expected 5
/* _____________ Your Code Here _____________ */ type Length<T extends readonly any[]> = T['length'] /* _____________ Test Cases _____________ */ import type { Equal, Expect } from '@type-challenges/utils' const tesla = ['tesla', 'model 3', 'model X', 'model Y'] as const const spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT'] as const type cases = [ Expect<Equal<Length<typeof tesla>, 4>>, Expect<Equal<Length<typeof spaceX>, 5>>, // @ts-expect-error Length<5>, // @ts-expect-error Length<'hello world'>, ]
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