{"author_url":"https://blog.hatena.ne.jp/bouzuya/","blog_url":"https://bouzuya.hatenablog.com/","description":"JavaScript \u306e Array.prototype.concat \u3067\u5927\u304d\u306a\u914d\u5217\u3092\u6271\u3063\u305f\u3068\u304d\u306e\u51e6\u7406\u6642\u9593\u3092\u78ba\u8a8d\u3057\u305f\u3002 (a) => a.reduce((acc, i) => acc.concat([i]), []);a \u304c 10^5 \u500b\u306e\u3068\u304d\u624b\u5143\u3067 28000ms \u304b\u304b\u3063\u305f\u3002(a) => { const l = a.length; const b = new Array(l); for (let i = 0; i < l; i++) { b[i] = a[i]; } return b;}\u3053\u308c\u306a\u3089 2ms \u3002\u2014 bouzuya (@bouzuya) 2019\u5e743\u670827\u65e5 AtCoder \u306e 2\u2026","categories":[],"provider_name":"Hatena Blog","provider_url":"https://hatena.blog","height":"190","version":"1.0","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fbouzuya.hatenablog.com%2Fentry%2F2019%2F03%2F27%2F225342\" title=\"Array.prototype.concat \u306b\u6ce8\u610f\u3059\u308b - bouzuya.hatenablog.com\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"Array.prototype.concat \u306b\u6ce8\u610f\u3059\u308b","width":"100%","author_name":"bouzuya","image_url":null,"blog_title":"bouzuya.hatenablog.com","type":"rich","published":"2019-03-27 22:53:42","url":"https://bouzuya.hatenablog.com/entry/2019/03/27/225342"}