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41 lines
1.3 KiB
41 lines
1.3 KiB
import type { Equal, Expect } from '@type-challenges/utils'
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type cases = [
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Expect<Equal<Fill<[], 0>, []>>,
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Expect<Equal<Fill<[], 0, 0, 3>, []>>,
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Expect<Equal<Fill<[1, 2, 3], 0, 0, 0>, [1, 2, 3]>>,
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Expect<Equal<Fill<[1, 2, 3], 0, 2, 2>, [1, 2, 3]>>,
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Expect<Equal<Fill<[1, 2, 3], 0>, [0, 0, 0]>>,
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Expect<Equal<Fill<[1, 2, 3], true>, [true, true, true]>>,
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Expect<Equal<Fill<[1, 2, 3], true, 0, 1>, [true, 2, 3]>>,
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Expect<Equal<Fill<[1, 2, 3], true, 1, 3>, [1, true, true]>>,
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Expect<Equal<Fill<[1, 2, 3], true, 10, 0>, [1, 2, 3]>>,
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Expect<Equal<Fill<[1, 2, 3], true, 10, 20>, [1, 2, 3]>>,
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Expect<Equal<Fill<[1, 2, 3], true, 0, 10>, [true, true, true]>>,
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]
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type FillInternal<
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T extends unknown[],
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N,
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Start extends number = 0,
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End extends number = T['length'],
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Left extends unknown[] = [],
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Mid extends unknown[] = [],
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Right extends unknown[] = T,
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> =
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Right extends [infer Head, ...infer Tail]
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? Left['length'] extends Start
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? Mid['length'] extends End
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? [...Mid, Head, ...Tail]
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: FillInternal<T, N, Start, End, Left, [...Mid, N], Tail>
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: FillInternal<T, N, Start, End, [...Left, Head], [...Left, Head], Tail>
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: [...Mid, ...Right]
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;
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type Fill<
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T extends unknown[],
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N,
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Start extends number = 0,
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End extends number = T['length'],
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> = FillInternal<T, N, Start, End>
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; |