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<!--info-header-start--><h1>获取元组长度 </h1><blockquote><p>by sinoon <a href="https://github.com/sinoon" target="_blank">@sinoon</a></p></blockquote><p><a href="https://tsch.js.org/18/play/zh-CN" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.md" target="_blank"></a> <a href="./README.ja.md" target="_blank"></a> <a href="./README.ko.md" target="_blank"></a> </p><!--info-header-end-->

创建一个Length泛型，这个泛型接受一个只读的元组，返回这个元组的长度。

例如：

ts
type tesla = ['tesla', 'model 3', 'model X', 'model Y']
type spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT']

type teslaLength = Length<tesla> // expected 4
type spaceXLength = Length<spaceX> // expected 5
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