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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103
5
章
ストリーム
Node
のプログラミングをストリーム（
Stream
）抜きで語ることはできません。「
Stream all the things
（すべてをストリームにせよ）」という標語が、
Node
のコミュニティにおいてたびたび聞かれるほどです。
Node
の主要コントリビュータである
Dominic Tarr
は、ストリームを「
Node
で最高の、しかしもっとも
誤解されているアイデア」と表現しています。ストリームがここまで注目されるようになった理由とし
ては、それが単に技術的に優れているだけではなく、そのエレガントさが
Node
の哲学に非常にうまく
マッチするという点があるのでしょう。
この章では次の事柄について説明します。
●
Node
においてなぜストリームが重要なのか
●
ストリームの基本的な使い方
●
I/O
以外でのストリームの利用法
●
複数のストリームを組み合わせて利用する場合のさまざまなパターン
5.1
ストリームの重要性
Node
のようなイベント駆動型のプラットフォームにおいて、
I/O
を扱うもっとも効率的な方法は、そ
れをリアルタイムで処理することです。すなわち、入力があった時点ですぐさま処理を開始し、何らか
の結果が得られた時点でそのつど出力する、という手法です。
まずこの節では、ストリームを使ったリアルタイム処理の基礎概念とその強みに関して説明し、続く
節でストリームの具体的利用法を見ます。
5.1.1
バッファ
vs.
ストリーム
ここまでに登場した
Node
の非同期
API
は、ほぼすべて「バ
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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.