javascript - TDD 和参数验证 Javascript

Question

如何保持代码干燥并遵循 TDD 原则？想象一下两个具有相同参数的函数依次调用。仅在第一个函数中进行检查/验证显然会带来性能提升，但如何单独测试这些函数？

Answer 1

这是唐纳德·高德纳 (Donald Knuth) wrote :

Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%.

从性能 Angular 来看，验证真的很重要吗？如果不是，优化就没有意义。您将花费更多的时间和精力来处理由于缺乏验证而导致的错误。

在极少数情况下，验证确实对性能至关重要(或复杂)，您可以将其移出并仅检查函数是否调用验证器。并且验证器可以缓存验证结果，以免影响性能。当然，您还需要对验证器逻辑和缓存逻辑进行测试，这不是初始函数逻辑的一部分。