Fill

介绍

Fill<T, N, Start?, End?> 接受4个类型参数, T和N是必需, Start和End是可选. T必须是一个元组, N可以是任意值类型, Start和End必须是大于或等于0的正数.

ts
type exp = Fill<[1, 2, 3], 0> // expected to be [0, 0, 0]

ts
type exp = Fill<[1, 2, 3], 0> // expected to be [0, 0, 0]

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起点

ts
/* _____________ Your Code Here _____________ */
 
type Fill<
  T extends unknown[],
  N,
  Start extends number = 0,
  End extends number = T['length'],
> = any
 
/* _____________ Test Cases _____________ */
 
type cases = [
  Expect<Equal<Fill<[], 0>, []>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[], 0, 0, 3>, []>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], 0, 0, 0>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], 0, 2, 2>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], 0>, [0, 0, 0]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true>, [true, true, true]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 0, 1>, [true, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 1, 3>, [1, true, true]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 10, 0>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 10, 20>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 0, 10>, [true, true, true]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.]

ts
/* _____________ Your Code Here _____________ */
 
type Fill<
  T extends unknown[],
  N,
  Start extends number = 0,
  End extends number = T['length'],
> = any
 
/* _____________ Test Cases _____________ */
 
type cases = [
  Expect<Equal<Fill<[], 0>, []>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[], 0, 0, 3>, []>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], 0, 0, 0>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], 0, 2, 2>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], 0>, [0, 0, 0]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true>, [true, true, true]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 0, 1>, [true, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 1, 3>, [1, true, true]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 10, 0>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 10, 20>, [1, 2, 3]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.  Expect<Equal<Fill<[1, 2, 3], true, 0, 10>, [true, true, true]>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.]

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解决方案

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ts
 
type Fill<
  T extends unknown[],
  N,
  Start extends number = 0,
  End extends number = T['length'],
> = any

ts
 
type Fill<
  T extends unknown[],
  N,
  Start extends number = 0,
  End extends number = T['length'],
> = any

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Fill

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