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
プロミス
77
4.1.2
プロミスの実装
Node
および
JavaScript
において、
Promises/A+
に準拠した実装が複数ありますが、よく使われてい
るものとしては以下があります。
●
Bluebird
−
https://npmjs.org/package/bluebird
●
Q
−
https://npmjs.org/package/q
●
RSVP
−
https://npmjs.org/package/rsvp
●
Vow
−
https://npmjs.org/package/vow
●
When.js
−
https://npmjs.org/package/when
●
ES2015 Promise
これらの実装の差異は、主に
Promises/A+
に追加された
API
です。
Promises/A+
は
then()
メソッ
ドの振る舞いのみを規定しており、プロミスの生成方法等に関してはいっさい言及していません。
この
本では
ES2015
のプロミスのみを扱います。なぜなら、
Node
はバージョン
4
以降
ES2015
のプロ
ミスをサポートしており、外部ライブラリに頼らずプロミスの利用が可能だからです。
ES2015
のプロミスが提供している
API
を次にあげます。
●
コンストラクタ（
new Promise(function(resolve, reject) {})
）
−
プロミスオブジェ
クトを生成。
resolve
されるか、もしくは
reject
されるかは、引数として渡される関数により決定
される。この関数の引数は
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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.