{"url":"https://culage.hatenablog.com/entry/2022/10/20/000000","type":"rich","provider_name":"Hatena Blog","published":"2022-10-20 00:00:00","author_name":"ku__ra__ge","provider_url":"https://hatena.blog","image_url":null,"description":"https://yucatio.hatenablog.com/entry/2019/04/07/110721 `new Array(n)`\u306f\u3001length\u304cn\u3068\u3044\u3046\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u3092\u6301\u3063\u305f\u914d\u5217\u3092\u4f5c\u6210\u3057\u3066\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30ad\u30fc\u306f\u6301\u3063\u3066\u3044\u306a\u3044\u3002 \u3088\u3063\u3066\u305d\u308c\u306bmap\u3092\u304b\u3051\u3066\u3082\u3001\u4f55\u3082\u8d77\u304d\u306a\u3044\u3002\uff08map\u306f\u5404\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u5bfe\u3057\u3066\u51e6\u7406\u3092\u884c\u3046\u3082\u306e\u3060\u304b\u3089\uff09 // new Array(n)\u306bmap\u3092\u304b\u3051\u3066\u3082\u4f55\u3082\u8d77\u304d\u306a\u3044 new Array(5).map(_=>1); // -> Array(5) [ <5 empty slots> ] // \u3053\u308c\u3092\u56de\u907f\u3059\u308b\u306b\u306f\u3001fill\u304b\u30b9\u30d7\u30ec\u30c3\u30c9\u5c55\u958b\u3092\u4f7f\u3046\u3002 new Array(5\u2026","blog_url":"https://culage.hatenablog.com/","width":"100%","categories":["program"],"blog_title":"\u304f\u3089\u3052\u306eChangeLog","version":"1.0","author_url":"https://blog.hatena.ne.jp/ku__ra__ge/","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fculage.hatenablog.com%2Fentry%2F2022%2F10%2F20%2F000000\" title=\"new Array(n) \u306b\u306fmap\u3092\u304b\u3051\u3066\u3082\u4f55\u3082\u623b\u3089\u306a\u3044 - \u304f\u3089\u3052\u306eChangeLog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","title":"new Array(n) \u306b\u306fmap\u3092\u304b\u3051\u3066\u3082\u4f55\u3082\u623b\u3089\u306a\u3044"}