May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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250
8
章 ユニバーサル
JavaScript
8.1
ブラウザとのコード共有
Node
の主な「売り」のひとつが、
JavaScript
で書かれていて、多くのユーザーに使われている
Chrome
ブラウザに搭載されたエンジンの
V8
で実行されるということです。これだけで
Node
とブラウ
ザでのコード共有は簡単だと結論できると思ってしまうかもしれませんが、共有するのが小さくて自己
完結した汎用のコードフラグメントの場合は別として、常にそうとは言えません。クライアントとサー
バの両方で使えるコードを開発するには、本来別物の両環境で同じコードがきちんと動作するよう、無
視できないレベルの努力が要求されるのです。たとえば、
Node
では
DOM
やビューはなく、一方ブラ
ウザにはファイルシステムもなければ新しいプロセスを開始する能力もありません。さらに、
Node
で
は新しい
ES2015
の機能の多くが安全に使えますが、ブラウザではそうはいきません。
ES2015
対応の
ウェブブ
ラウザのシェアが
100%
になるにはまだ時間がかかるでしょうから、それまでクライアントでは
ES5
のコードを実行させるのが安全です。
こうしたわけで、両プラットフォーム向け開発で要求される努力のほとんどが、今述べた違いを最小
限にまで減らすことなのです。それには、抽象化とパターンの力を借りて、アプリケーションがブラウ
ザ向けコードと
Node
コードの間で実行時に動的に、あるいはビルド時に、切り替えられるようにしま
す。
幸いなことに、この可能性に対する関心が高
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.