自己的Ruby学习误区

ROR离我很近,Ruby却离我很远.

学习ROR已经有段时间了,也试着做一个demo项目.遇到了不少的问题,大都也都解决了.这几天下载了typo的代码.
打开粗率的看了一遍. 至少有60%的代码看不懂,不知道为什么要这么写.这一对比才发现一个问题,自己原来始终用错误的方式在学习和使用ROR.

仗着自己有开发经验,然后快速学习了一遍Ruby和ROR.马上就动手开发项目.错,实在是大错特错.很多Ruby的思想根本没有理会,最终写出来的代码,只不过就是换了种语言而已,骨子里头还是以前.换汤不换药.

Ruby本身有很多精妙之处,还得重新学习和领会才行.看来Ruby根本无法快速学习,以往的语言使用经验起的作用也是负面大于正面.
参考Typo,准备从头演练Ruby.

评论

35 楼 edwardpro 2007-06-04  

应该先看ruby的书的，直接看rails基本上改不了习惯，感觉ruby就是喜欢用block，用得入魔了，平时我们都是function概念的东西人一个block解决一大堆，这应该是很大的不同地方。

34 楼 darkjune 2007-06-03  

脚本语言跟以前的正统面向对象还是有挺大差别的

33 楼 sizhefang 2006-11-30  

找到一个老外出的自称能让你看懂rails代码的ruby教程,我花一天时间仔细看了一下,感觉还可以.
http://sitekreator.com/satishtalim/index.html

32 楼 sizhefang 2006-11-30  

在学习ror之前,粗略的看了一遍ruby的语法,就开始看Agile Web...了,一开始有很多Depot的代码看不懂,可硬着头皮往下看,遇到不懂的地方就google,现在把那本书已经基本上看完第一遍了,回头看第二边的时候就照着Depot的例子敲代码(当然只有在自己认为已经明白了代码是什么意思之后才写后面的代码),就这样滚雪球式的学习ruby on rails.最理想的是在自己认为水平差不多了,能找个兼职做做,体验一下真实项目中的感觉.这样等自己用他做项目的时候,技术沉淀就差不多了.

31 楼 s5kk 2006-11-30  

很不幸，我刚开始看的就是 The Ruby Way, 特郁闷，
然后看到 javaeye 的人说ruby怎么怎么好，怎么怎么容易，大汗。
后来看到agile那本书，才明白原来很多人只不过是雾里看花。

30 楼 mathsfan 2006-11-30  

有点道理，目前我就只是照着透明的那本书做，很多都弄不懂哦

29 楼 axgle 2006-11-15  

roseanne 写道

Huge thanks!

谢谢胡戈! (Don't worry,this is a chinese humor)

28 楼 roseanne 2006-11-15  

引用

By the name convention of Ruby, I think they should really be named as 'pop!' and 'push!'

Hey, I thought so too, and check the RubyAPI Doc...

I guess you explanation makes sense.

Huge thanks!

27 楼 cookoo 2006-11-15  

Pop and push have side effects: they are destructive to data. That's why aardvark pop then push back in order to maintain the state. By the name convetion of Ruby, I think they should really be named as 'pop!' and 'push!'

While I use parallel assignment, which simply makes a copy of data without any change.

26 楼 roseanne 2006-11-15  

I wrote a random driver to run them at the same time to compare the efficiency and correctness.

aardvark and cookoo code seem equivalent to me.

However, I took line #7 of aardvark code of, the method does not work correctly sometimes.

I made cookoo code almost the same as aardvark code without line #7, it works correctly. I am still confused...

  

25 楼 aardvark 2006-11-15  

head, *tail = nums

还是cookoo对ruby熟,这个用法我不会,只好pop再push.
ruby要学的太多了.

24 楼 森海 2006-11-15  

刚买了一本书，收到，开始学习这个

23 楼 roseanne 2006-11-15  

Thanks cookoo
I got it!!!!

22 楼 roseanne 2006-11-15  

I fixed my bug there for the poor Java kid first.

21 楼 roseanne 2006-11-15  

Hey, cookoo

Sorry!

I was in a meeting and did not refresh the screen, and did not see your code.

Now, it is time to try yours...

Wait! Thanks first!!!!

20 楼 roseanne 2006-11-15  

Wow, I love it!!!
试君一程序，胜读三月书！
Huge Thanks, aardvark!!!!

A long long learning curve is waiting for me for sure.
I know I am not a ruby programmer, not yet!

=============
Deleted some of my wrong comments on line #7
===============

I am waiting for some other solutions.
You guys are just great!

19 楼 cookoo 2006-11-15  

Rachgirl, basically I follow your logic with a small bug fixed:

def bag(nums,sack)
  return true if nums.include?(sack)
  return false if sack < 0 or nums.empty?
  head, *tail = nums 
  return true if bag(tail, sack - head)
  if tail.size >= 2 then bag(tail, sack) else return false end
end

The bug in your original code is the omission of condition "sack < 0", therefore when sack = 13, nums = [5,4,3,2], the result will be true, while actually should be false.

18 楼 aardvark 2006-11-15  

roseanne 写道

Here is my little piece of Java/C++ like Ruby code, solved a small problem for others.

If somebody can rubylize the code for me, it will be greatly appreciated!!!!!

The link:
http://bbs.chinajavaworld.com/thread.jspa?threadID=729132&tstart=4

You can read and know what problem I want to solve. Algorithm highlight is there too.

You can post you code in either forum. Better here!

Thanks in Advance!!!!

def bag(volume, items)
  puts "bag #{volume}, [#{items.join(',')}]"
  return true if items.include?(volume)
  return false if volume < 0 || items.empty?
  item = items.pop
  return true if bag(volume - item,items) || bag(volume, items)
  items.push(item)
  return false
end

puts bag(15,[2,9,8,5,3])

刚开始学ruby,抛块砖先

17 楼 roseanne 2006-11-15  

Here is my little piece of Java/C++ like Ruby code, solved a small problem for others.

If somebody can rubylize the code for me, it will be greatly appreciated!!!!!

The link:
http://bbs.chinajavaworld.com/thread.jspa?threadID=729132&tstart=4

You can read and know what problem I want to solve. Algorithm highlight is there too.

You can post you code in either forum. Better here!

Thanks in Advance!!!!

16 楼 roseanne 2006-11-15  

Languages are just tools to get the job done!!!!

I think it is OK to write Java/C++ like ruby code, we are in a learning process, we have more than one way to solve the problem.

Because I am working in C++, I am only using ruby to solve some side problems at work, when I write more, my code is more Ruby-like.

I wrote a RoR prototype too, I was using SQL to solve many database problems, since I did not have enough time to learn and do the ruby way.

I am OK, at least I think...