{"url":"https://hokaccha.hatenablog.com/entry/2020/08/26/101041","version":"1.0","description":"const obj: any = { a: 1, b: \"x\" }; function foo<T, U>(x: U): [T, U] { return [obj[x], x]; } \u3053\u3046\u3044\u3046\u30b3\u30fc\u30c9\u304c\u3042\u3063\u305f\u3068\u3059\u308b\u3002\u30b3\u30fc\u30c9\u306e\u826f\u3057\u60aa\u3057\u306f\u7f6e\u3044\u3068\u3044\u3066\u3001U \u306f\u5f15\u6570\u304b\u3089\u63a8\u8ad6\u3057\u3066\u3001T \u306f\u547c\u3073\u51fa\u3059\u5074\u304b\u3089\u6307\u5b9a\u3057\u305f\u3044\u3068\u3044\u3046\u30b1\u30fc\u30b9\u3002 // \u3053\u3046\u66f8\u304d\u305f\u3044\u3051\u3069\u30a8\u30e9\u30fc foo<number>(\"a\"); // Expected 2 type arguments, but got 1 // \u3053\u308c\u306f\u901a\u308b foo<number, string>(\"a\"); \u3053\u308c\u306f\u4eca\u73fe\u5728\uff08TypeScript 4.0\uff09\u3067\u306f\u3067\u304d\u306a\u3044\u307f\u305f\u3044\u3067\u3001Pr\u2026","categories":["TypeScript"],"type":"rich","width":"100%","provider_url":"https://hatena.blog","published":"2020-08-26 10:10:41","blog_url":"https://hokaccha.hatenablog.com/","height":"190","title":"TypeScript \u3067\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306e\u90e8\u5206\u7684\u306a\u578b\u63a8\u8ad6\u304c\u3067\u304d\u306a\u3044","author_url":"https://blog.hatena.ne.jp/hokaccha/","blog_title":"hokaccha memo","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fhokaccha.hatenablog.com%2Fentry%2F2020%2F08%2F26%2F101041\" title=\"TypeScript \u3067\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306e\u90e8\u5206\u7684\u306a\u578b\u63a8\u8ad6\u304c\u3067\u304d\u306a\u3044 - hokaccha memo\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","author_name":"hokaccha","image_url":null,"provider_name":"Hatena Blog"}