April 2020
Intermediate to advanced
177 pages
1h 45m
Chinese
Content preview from 精通模块化JavaScript
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4.4
数据结构为王
｜
107
因此，应该让处理某个特定数据结构的代码包含在尽可能少的模块中。比如，
假设我们有一个
BlogPost
数据库模型，一开始将所有关于
BlogPost
的逻辑
都放到一个文件中是合情合理的。在那个文件中，我们可以暴露一个
API
供使用者创建、部署、编辑、删除、更新、搜索或者分享博客文章。随着
相关的功能越来越丰富，我们可以选择将逻辑分散到几个位于相同位置的
文件中 ：其中一个文件可能处理搜索，解析原始的终端用户的查询标签和
术语，然后将其传递给
Elasticsearch
或者其他搜索引擎 ；另一个文件可能
处理分享，暴露一个
API
，用于以邮件的形式或者通过其他社交平台分享
文件，以此类推。
将逻辑拆分到同一个目录下的多个文件中，有助于防止功能“爆炸”，这些
功能很大程度上只有数据结构是相同的，可以将其与功能紧密相关的代码
放在一起。
还有一个方案是，将应用程序某个特定方面的相关逻辑（如博客文章）直
接放到需要这个逻辑的组件中，但是在未加控制的情况下会造成麻烦。这
样做可能于短期生产力有益，但从长远来看，我们需要担心将逻辑（在这
个例子中是与博客文章严格相关的逻辑）与完全不同的关注点耦合的问题。
同时，如果我们将大量逻辑分散到不相关的组件中，在对代码进行大规模
更新时，可能有遗漏功能的关键部分的风险。最终我们可能会做出错误的
假设，或者犯下在未来的某个时间点才可能变得明显的错误。
当不清楚功能是否会增加或者会如何增加时，一开始将逻辑直接放到需要
它的地方是可以接受的。一旦初期探索阶段结束，并且知道该功能会继续 ...
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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.