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first of Array #342

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FailurMan opened this issue Dec 30, 2022 · 0 comments

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FailurMan commented Dec 30, 2022 •

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//使用ts实现获取数组第一项
type arr1 = ["a", "b", "c"];
type arr2 = [3, 2, 1];

type First<T extends any[]> = T extends [infer First, ...infer Rest]
  ? First
  : never;

type head1 = First<arr1>;
type head2 = First<arr2>;
type t1 = First<[]>;

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