• 並非別人就是天才，自己就是笨蛋。
  • 自己知道自己哪裡癢、怎麼癢，會癢就抓！

• 為什麼要自己來？
  • 可以是為了學習，也可以是因為不想學習。自己來是有多難？

• 簡單 != 很快可以解決
  花時間 != 困難

• 東西放出去，就要有心理準備持續收到 mail，即使那只是自己一時的小玩具。
  • 技巧：減少自己的 address 曝光、提早建立社群

There's this little trick you can get away with that'll save you some headaches:

<img src="//domain.com/img/logo.png">

If the browser is viewing that current page in through HTTPS, then it'll request that asset with the HTTPS protocol, otherwise it'll typically* request it with HTTP. This prevents that awful "This Page Contains Both Secure and Non-Secure Items" error message in IE, keeping all your asset requests within the same protocol.

*Of course, if you're viewing the file locally, it'll try to request the file with the file:// protocol.

https 的頁面中若送出 http 的 request，就會收到 browser 的警告。

若該 resource 同時可以透過 https 和 http 取得，則不要把 protocol 寫出來，在 https 的頁面中 browser 會自行決定採 https。

寫文件有很多好處，包含讓更多人了解你的 project，進而願意使用甚至 contribute；
寫文件也是個機會，讓自己停下來了解自己的 code 是否有問題。

slide 中提到不少產生 doc 的好工具，像是 RDoc、YARD、TomDoc……等。

• CSS rule 的 specificity 越高，priority 越高。
• specificity 可由該 rule 包含的 selector 計算總分
  • HTML element: 1
  • class: 10
  • id: 100

1. 好的語言不該限制思考；
2. 簡潔 != 簡單。

作者在別場演講的講稿（應該是同份 slide）：
http://www.rubyist.net/~matz/slides/oscon2003/power.txt

1. RubyScript2Exe：把所有檔案在 temp dir 展開，速度比較慢。作者很久沒更新了，Ruby 1.8.6 之後無法使用。
2. Exerb：不使用 temp dir 的方式，有 RubyGems 相關問題，作者自己沒什麼在用了。
3. OCRA：只包進需要的檔案，所以比較快。建議使用。
4. Crate：把 code 和 lib 存在 sqlite3 db 裡。
5. Zip：把 win32 版 ruby 和所寫的程式放一起，寫個 .bat 檔啟動。Exerb 的作者現在用這方法。

個人經驗：
之前嘗試的時候，RubyScript2Exe 失敗；OCRA 在 XP 上可以，Win7 x64 不行；Exerb 想試還沒試（作者還有在更新）；Crate 好像值得一試；zip 真是最後的終極解法（但和沒解差不多）。

演講的下半段，是把 web app 包起來當做桌面程式。

- Ability to scale != performance
- Premature optimization is the root of all evil. e.g. " v.s. ', echo v.s. print
- Do not use .htaccess (move to real apache config)

/* From the user's style sheet */
p { text-indent: 1em ! important }
p { font-style: italic ! important }
p { font-size: 18pt }

/* From the author's style sheet */
p { text-indent: 1.5em !important }
p { font: normal 12pt sans-serif !important }
p { font-size: 24pt }

To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.

<one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

Also add information on how to contact you by electronic and paper mail.

If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:

<program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.

細節可參考「How to use GNU licenses for your own software」。

- 隨軟體附上檔名 COPYING，內容是 GPL 的純文字版。

- 每個檔案開頭最好都要寫「This file is part of <program>.」，接著是 copyright notice（誰寫的）和 copying permission statement（表明使用 GPL）。把 <program> 和「this program」換成軟體名稱。

- 可以要求工作的雇主或學校簽署 copyright disclaimer，以免未來他們說著作權是屬於他們的。

var results = jLinq.from(data.users)
    .is("admin")
    .greater("age", 25)
    .orderBy("-age") //the '-' means descending
    .select();

LINQ 是 .NET 的 lib，選取部分資料時，可以 method chaining 方式，達到類似 SQL 的 operator，如 select、where……等的效果。
jlinq 這個 lib 則讓使用者可以對 JSON 裡的 object 下 LINQ style query。