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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8.5
ユニバーサル
JavaScript
アプリケーションの作成
281
今度は前のサンプルプログラムにあった
2
つの著者専用コンポーネントの代わりに新しい汎用のコン
ポーネント
AuthorPage
を使っています。ルーティングの仕組みも変えています。今回は、コンポー
ネント
Routes
の関数
render
内にコンポーネント
Route
を入れる代わりに、
JavaScript
の配列を使っ
てルーティングを定義しています。配列オブジェクトはコンポーネント
Router
の属性
routes
に渡さ
れます。この設定は、前のサンプルで見たタグを使ったものとまったく等価ですが、ときにはこちら
のほうが書きやすいでしょう。もちろん、ネストされたルーティングが多数あるときなど、タグを使っ
た設定のほうが扱いやすい場合もあります。ここでの重要な変更点は、以前の個別ルーティングに代
わって登場した、新たな汎用コンポーネントとリンクされた新たな
/author/:id
というルーティング
です。このルーティングはパラメータを受け付けるようになっており（見てわかるように名前付きパラ
メータは「コロン前置形式」で定義されています）、以前のルーティングである
/author/joyce
と
/
author/h-g-wells
の両方にマッチします。もちろん、この形式であればこの種のどのようなルート
にもマッチし、パラメータ
id
にマッチした文字列はコンポーネントに直接渡され、そのコンポーネント
は
props.params.id
を読むことでそれにアクセスで
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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.