学习编写代码的最佳技术之一是对现有代码进行反向工程。代码培训公司Treehouse解释了如何“打破”代码，以更好地了解它是如何工作的。

Nick Pettit在Treehouse博客上举了一个例子，他想学习浏览器中的3D编程，并测试一行Javascript脚本Three.js：

The following is a code example that uses three.js to create a light:

If you have some programming experience, you might be able to read this and figure out most of what’s happening here. If there are any blanks or assumpti*** you’re unsure about, you can test them with the following techniques:

1. Delete one line at a time to see if it’s necessary for your goals.
2. Delete one line at a time to better understand its function. Even if you think you know what a line does, try deleting it anyway to test your assumpti***.
3. Change variables and function arguments to see if you can manipulate them in a way that matches your mental model.
4. Swap the order of various lines to see if things can be done “out of order” or if there’s some significance to the sequence of operati***.

As you test each line, you’ll start to build a mental model and make correcti*** to other assumpti*** you made previously. Soon, the whole picture will start to make sense.

关键是一次分解一件事情，看看有什么变化，这样您就可以理解代码中所有部分之间的关系。

自学成才的程序员可能已经知道逆向工程他人代码的巨大价值，但正如Treehouse所指出的，这种策略并没有得到足够的重视。多亏了慷慨共享的开源代码，你可以通过破解它来学习任何东西。

学习编码的秘密|树屋博客

哈克尼摄。