Rob Pike's 5 Rules of Programming

拼搏现实的明天。 2023-07-22 09:09 3阅读 0赞

摘自:[http://users.ece.utexas.edu/~adnan/pike.html][http_users.ece.utexas.edu_adnan_pike.html]

### Rob Pike's 5 Rules of Programming ###

*  **Rule 1.** You can't tell where a program is going to spend its time. Bottlenecks occur in surprising places, so don't try to second guess and put in a speed hack until you've proven that's where the bottleneck is.
    
     
 *  **Rule 2.** Measure. Don't tune for speed until you've measured, and even then don't unless one part of the code overwhelms the rest.
    
     
 *  **Rule 3.** Fancy algorithms are slow when n is small, and n is usually small. Fancy algorithms have big constants. Until you know that n is frequently going to be big, don't get fancy. (Even if n does get big, use Rule 2 first.)
    
     
 *  **Rule 4.** Fancy algorithms are buggier than simple ones, and they're much harder to implement. Use simple algorithms as well as simple data structures.
    
     
 *  **Rule 5.** Data dominates. If you've chosen the right data structures and organized things well, the algorithms will almost always be self-evident. Data structures, not algorithms, are central to programming.

Pike's rules 1 and 2 restate Tony Hoare's famous maxim "Premature optimization is the root of all evil." Ken Thompson rephrased Pike's rules 3 and 4 as "When in doubt, use brute force.". Rules 3 and 4 are instances of the design philosophy KISS. Rule 5 was previously stated by Fred Brooks in The Mythical Man-Month. Rule 5 is often shortened to "write stupid code that uses smart objects".

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# Rob Pike关于编程的五个原则 #

规则1： 你没法预测程序会将时间花费在哪儿。瓶颈会发生在意想不到的地方，除非你已经测试并定位了瓶颈，否则不要尝试去猜测和优化它。

规则2：测量。在测量之前不要为了提升速度优化代码。即使是在测量之后，也不要随意优化除非其中的一部分代码已经压倒其余代码。

规则3：当n很小的时候好的代码是很慢的，并且n通常都很小。好的算法都有一个很大的常量，除非你知道n很快就会变得很大，否则还是不要使用好的代码（即使n变大了，也先使用 规则2）。

规则4：好的算法比简单的算法更容易产生bug，并且它也更难去实现。尽可能使用简单的算法和简单的数据结构。

规则5：数据主导。如果你选择了正确的数据结构并且组织得很好，算法几乎总是不言而喻的。 数据结构，而不是算法，是编程的核心。

简要：

派克的规则1和2重申了托尼·霍尔（Tony Hoare）着名的“过早优化是万恶之源”的格言。

肯·汤普森（Ken Thompson）将派克（Pike）的规则3和4改写为：“如果有疑问，请使用暴力”。 规则3和4是KISS设计理念的实例。

规则5以前由弗雷德·布鲁克斯在“人月神话”中说过。 规则5通常缩写为“编写使用智能对象的愚蠢代码”。

中文译文摘自：[https://www.jianshu.com/p/2c6c3dfa6e9f][https_www.jianshu.com_p_2c6c3dfa6e9f]

[http_users.ece.utexas.edu_adnan_pike.html]: http://users.ece.utexas.edu/~adnan/pike.html
[https_www.jianshu.com_p_2c6c3dfa6e9f]: https://www.jianshu.com/p/2c6c3dfa6e9f