- Common behavior
- Decoupling
- Restricting behavior
Common behavior:
Restricting behavior:
The last use case we will discuss can be pretty counterintuitive at first sight. It’s about restricting a type to a specific behavior. Let’s imagine we implement a custom configuration package to deal with dynamic configuration. We create a specific container for int configurations via an IntConfig struct that also exposes two methods: Get and Set. Here’s how that code would look:
Now, suppose we receive an IntConfig that holds some specific configuration, such as a threshold. Yet, in our code, we are only interested in retrieving the configuration value, and we want to prevent updating it. How can we enforce that, semantically, this configuration is read-only, if we don’t want to change our configuration package? By creating an abstraction that restricts the behavior to retrieving only a config value:
Then, in our code, we can rely on intConfigGetter instead of the concrete implementation:
In this example, the configuration getter is injected into the NewFoo factory method. It doesn’t impact a client of this function because it can still pass an IntConfig struct as it implements intConfigGetter. Then, we can only read the configuration in the Bar method, not modify it. Therefore, we can also use interfaces to restrict a type to a specific behavior for various reasons, such as semantics enforcement.
Interfaces are made to create abstractions. And the main caveat when programming meets abstractions is remembering that abstractions should be discovered, not created. What does this mean? It means we shouldn’t start creating abstractions in our code if there is no immediate reason to do so. We shouldn’t design with interfaces but wait for a concrete need. Said differently, we should create an interface when we need it, not when we foresee that we could need it.
【推荐】国内首个AI IDE,深度理解中文开发场景,立即下载体验Trae
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步
· 震惊!C++程序真的从main开始吗?99%的程序员都答错了
· 【硬核科普】Trae如何「偷看」你的代码?零基础破解AI编程运行原理
· 单元测试从入门到精通
· 上周热点回顾(3.3-3.9)
· winform 绘制太阳,地球,月球 运作规律