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<!--info-header-start--><h1>First of Array </h1><blockquote><p>by Anthony Fu <a href="https://github.com/antfu" target="_blank">@antfu</a></p></blockquote><p><a href="https://tsch.js.org/14/play/ko" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.md" target="_blank"></a> <a href="./README.zh-CN.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> </p><!--info-header-end-->

배열(튜플) T를 받아 첫 원소의 타입을 반환하는 제네릭 First<T>를 구현하세요.

예시:

ts
type arr1 = ['a', 'b', 'c']
type arr2 = [3, 2, 1]

type head1 = First<arr1> // expected to be 'a'
type head2 = First<arr2> // expected to be 3
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