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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5.2
ストリームの基本的な使い方
111
を終えた）や
error
（何かがうまく行かない）などといったイベントを生成します。
この章の例題では記述を簡潔にするためにエラー処理を省略している場合があります。実
用的なアプリケーションを作成する場合は、すべてのストリームに対してイベントリス
ナー
error
を登録しましょう。
ストリームは次の
2
つのモードのどちらも利用できるため、柔軟な処理が可能になります。
バイナリモード
データをバッファや文字列など「チャンク」の形でストリーム化するときに使われる
オブジェクトモード
離散的なオブジェクトとしてデータを処理する場合に使われる（これを使うことでほとんどす
べての
JavaScript
の値を使うことができる）
この
2
つのモードを利用できるため、あとで見るように関数的に処理ユニットを構成していくための
ツールとしても利用できるのです。
5.2.2
Readable
ストリーム
Readable
ストリームはデータの「ソース」を表現します。
stream
モジュールの抽象クラス
Readable
を使って実装されます。
5.2.2.1
ストリームからの読み込み
Readable
ストリームからデータを受理する方法にはnon-flowingとflowingの
2
種類があります。
non-flowing
モード
Readable
ストリームからの読み込みの標準的なパターンでは、
readable
イベントにリスナーをア
タッチします。このイベントは新しいデータが読み込み可能になったことを知らせるものです
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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.