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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6.5
アダプタ
173
に対して単純なテキスト検索が実行できるようになる
level-plus
（https://github.com/eugeneware/levelplus）
LevelUP
データベースのアトミックな更新を追加するプラグイン
6.5
アダプタ
アダプタは本来のものと異なるインタフェースを使ってオブジェクトへのアクセスを可能にするもの
です。名前が示唆するとおり、あるオブジェクトを、そのオブジェクトと異なるインタフェースを想定
しているコンポーネントが使用できるようにするアダプタとして働きます。次の図6-3が状況を説明し
ています。
アダプタ
（
Adapter
）
アダプタが取り付けられるもの
（
Adaptee
）
クライアント
methodA()
methodB()
methodC()
methodD()
methodC()
図6-3 アダプタパターン
図6-3はアダプタ（
Adapter
）が取り付けられる相手（
Adaptee
）を実質的にラップして、異なるインタ
フェースを提示させる様子を示しています。図は
Adapter
への操作が場合によって
Adaptee
のメソッド
を
2
つ以上組み合わせて実現される可能性があることも強調しています。実装の点から見るともっとも
よく見られる技法は合成で、アダプタのメソッドが、取り付けられる相手のメソッドへの橋渡しを提供
します。このパターンは非常に単純なので、すぐに実例に取りかかりましょう。
6.5.1
ファイルシステム
API
による
LevelUP
の利用
ここでは
LevelUP API ...
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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.