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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4
1
章
Node.js
の世界へようこそ
ウェアそのものの成長と改善を促すことになります。
Node
においては、この原則が
JavaScript
という非常に実
プ ラ グ マ テ ィ ッ ク
用主義的な言語によってもサポートされて
います。単純な関数やクロージャ、オブジェクトリテラルによって、複雑な階層をもったクラスを置き
換えてしまうことも珍しくはありません。純粋なオブジェクト指向の設計においては、往々にして、現
実世界そのものの不完全性や複雑性を考慮することなしに、厳密に数学的な概念を用いて現実世界を
忠実に再現しようとします。実際には我々の作るソフトウェアは常に現実世界の近似でしかありませ
ん。短時間にそれほど複雑ではないものを作るようにするほうが、膨大なコストをかけて大量のコード
を書き完璧に近いソフトウェアを作ろうとするよりも、得られる成果は大きいでしょう。
この本を通して同じような考え方が繰り返し登場します。たとえば、
S
シ ン グ ル ト ン
ingleton
や
D
デ コ レ ー タ
ecorator
といっ
た旧来からあるデザインパターンが、
Node
においては完璧ではないものの、単純な形で実装されます。
Node
の世界では、多くの場合、単純かつ実用的なアプローチのほうが純粋で完璧なアプローチよりも
優先されるのです。
1.2
リアクタパターン
それでは最初のパターンである
R
リ ア ク タ
eactor
について説明しましょう。リアクタパターンは
Node
の非同
期処理において中心的な役割を担うものです。まず、
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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.