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#00043 exclude #7

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pkc918 opened this issue Aug 10, 2023 · 0 comments
Open

#00043 exclude #7

pkc918 opened this issue Aug 10, 2023 · 0 comments

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@pkc918
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pkc918 commented Aug 10, 2023

问题

type Result = MyExclude<'a' | 'b' | 'c', 'a'> // 'b' | 'c'

不使用 exclude 并实现其效果

答案

type MyExclude<T, U> = T extends U ? never : T

讲解

exclude的作用就是，排除U类型后，T剩下的类型，所以刚好使用 extends 做条件判断
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