June 2022
Beginner to intermediate
672 pages
17h 23m
Japanese
Content preview from Head Firstデザインパターン 第2版 ―頭とからだで覚えるデザインパターンの基本
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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.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.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.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.
610
14
章
Memento
パターン
Memento
パターン
例えば、ユーザが「アンドゥ（元に戻す）」を要求する
など、オブジェクトを以前の状態に戻せる必要がある
場合、Mementoパターンを使いましょう。
シナリオ
あなたの開発した対話型のロールプレイングゲームは
大きな成功を収め、伝説の「レベル
13
」にたどり着こう
と試みる多数の熱狂的ファンを生み出しています。ユー
ザがより難易度の高いレベルに進むにしたがって、ゲー
ムオーバーになる確率が高くなります。何日も費やして
高いレベルに進んできたファンは、自分のキャラクター
が消滅して最初からやり直すことになると、当然ながら
イライラします。そのため、プレイヤーがゲームの進捗
を保存し、キャラクターが不当に消滅された場合でも少
なくともその労力のほとんどを回復できるように、「進行
状況の保存」コマンドを要求しています。「進行状況の保
存」機能は、復活したプレイヤーを最後に成功したレベ
ルまで戻すように設計する必要があります。
ゲームの状態を保存する方法につい
ては注意が必要ね。かなり複雑よ。他
の誰かがゲームの状態にアクセスして台無
しにし、私のコードをだめにしてほしくは
ないのよ。
you are here
611
14
章 付録
Memento
の働き
Memento
には
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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.