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题目解答: 测试用例:
/* _____________ 测试用例 _____________ */
import { Equal, Expect, ExpectFalse, NotEqual } from '@type-challenges/utils'
type cases = [
Expect<Equal<Push<[], 1>, [1]>>,
Expect<Equal<Push<[1, 2], '3'>, [1, 2, '3']>>,
Expect<Equal<Push<['1', 2, '3'], boolean>, ['1', 2, '3', boolean]>>,
]
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第一次尝试解答:
/* _____________ 答案,未能全部通过测试用例 _____________ */
type Push<T extends any[], U> = U extends any[] ? [...T, ...U] : [...T, U];
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第二次尝试解答:
/* _____________ 答案,可有全部通过测试用例 _____________ */
type Push<T extends any[], U> = [U] extends [any[]] ? [...T, ...U] : [...T, U];
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第三次尝试解答:
/* _____________ 答案,可有全部通过测试用例 _____________ */
type Push<T extends any[], U> = U extends any[] ? [...T, ...U] : [...T, U extends boolean ? boolean : U];
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接下来的一题是:【类型挑战】Unshift,难度⭐️