Walk into any bookstore, and you'll see how to Teach Yourself Java in 24 Hours alongside endless variations offering to teach C, SQL, Ruby, Algorithms, and so on in a few days or hours. The Amazon advanced search for [title: teach, yourself, hours, since: 2000 and found 512 such books. Of the top ten, nine are programming books (the other is about bookkeeping). Similar results come from replacing "teach yourself" with "learn" or "hours" with "days."
The conclusion is that either people are in a big rush to learn about programming, or that programming is somehow fabulously easier to learn than anything else. Felleisen et al. give a nod to this trend in their book How to Design Programs, when they say "Bad programming is easy. Idiots can learn it in 21 days, even if they are dummies." The Abtruse Goose comic also had their take.
reference:http://norvig.com/21-days.html
对于编程，我们现在在大环境之下，越来越要求速度，越来越浮躁。也许一天学会一门语言确实是可行的，因为你真的会编程的核心思想，语言只是一个工具。
这篇文章的大意，对于我自己而言，大概是。
1、不要光看书，去实践。
2、不要心急，学任何东西都是一个漫长的过程。
3、有计划的学，不断挑战自己不会的东西。
以上
2017/5/2
