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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268
8
章 ユニバーサル
JavaScript
サーバから直接供給されるため、（感覚的な）ロード時間が短縮し、検索エンジンにとってもコンテンツ
のインデックス作成がより充実してしかも容易になります。
React
バーチャル
DOM
には、画面変化をレンダリングする方法を最適化する能力もあります。つま
り、
DOM
が変化するたびに全部が描き換えられるわけではありません。
React
は賢いインメモリの差
分アルゴリズムを使って、ビューを更新するために
DOM
に適用すべき最小限の変更を事前計算できる
のです。結果として高速なブラウザ画面描画のための効率的な仕組みが得られます。
React
が他のライ
ブラリやフレームワークよりも牽引力があるのは、おそらくこれも重要な理由のひとつです。
説明はこれくらいにして、
React
を使い始めましょう。実際の例に取り組みます。
8.4.1
最初の
React
コンポーネント
React
を使ってみるために、ブラウザのウィンドウ内に要素の一覧を表示
する非常に単純なウィ
ジェットのコンポーネントを作成しましょう。
この例では、この章で今まで見てきた
Webpack
や
Babel
といったツールをいくつか使います。です
から、コードを書き始める前に、必要となる依存対象をすべてインストールしましょう。
$ npm install webpack babel-core babel-loader babel-preset-es2015
また、
React
と、
React
のコードを等価な
ES5
コードに変換する
Babel
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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.