April 2020
Intermediate to advanced
177 pages
1h 45m
Chinese
Content preview from 精通模块化JavaScript
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2.2
CRUST
原则：一致、弹性、明确、简单和小巧
｜
35
部件更少。当我们消除公共接口中不纯的部分时，就能有效地限制调用代
码的熵。使用者每次都会收到一个全新的计数器，该计数器完全负责管理
自己的状态。它仍然可以将
counter
传递给其依赖方，但它可以控制依赖
方操作该状态的方式（如果有的话）。
我们在一些流行的库中观察到了这一点，比如
Node.js
中的
request
包。这
些库可以用来发送
HTTP
请求
1
。
request
函数在很大程度上依赖于传递给它
的
options
参数的合法默认值。有时我们希望使用一组不同的默认值来发
送请求。
这个库可能已经提供了一种解决方案，使我们能够在每次调用
request
时
更改
options
的默认值。这将是个糟糕的设计，因为它会使对
options
的处
理更加不稳定。我们可能不得不考虑代码库的方方面面，才会对最终调用
request
时使用的
options
放心。
request
选择的解决方案是使用
request.defaults(options)
方法，返回与
request
相同的
API
，但是它在现有默认值的基础上应用新的默认值。这种
方法避免了意外情况，因为修改后的
request
仅限于在调用它的代码及其
依赖项中使用。
2.2
CRUST
原则 ：一致、弹性、明确、简
单和小巧
一个
API
要得到使用者的认可通常应该具备以下几个特点。它是
一致
的
（
consistent
），意味着它是幂等的
2
，并且具有与相关的函数相似的签名形态。
1
你可以在
GitHub
上找到
request
。
2
对于给定的一组输入，幂等函数总是产生相同的输出。 ...
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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.