REBOL is a simple yet powerful programming language that allows developers to quickly build applications. It has several advantages including being small in size, not requiring many files or configurations, and being very easy to learn and use. Some key things that can be done with just a few lines of REBOL code include creating graphical user interfaces, downloading and parsing web pages, and networking tasks like port scanning. The document discusses both strengths and weaknesses of REBOL, and encourages programmers to try it for its simplicity and flexibility.

1. REB IsL漫谈
Programming Fun Again
支付宝 蔡学镛

2. REBOL的劣势

3. 完美主义导致发展进度缓慢

4. 对僵化的脑袋来说，这语言有点别扭

5. 远远超出他们的理解

6. 加上核心代码没有开源

7. 好文档相当欠缺

8. 用户与市场需求相当小
0.0000001%

9. REBOL的优势

10. 不需要一堆文件与配置

11. 体积超级小…

12. 能做的事却不少

13. 而且很容易就可做到(嗯…上手以后啦)

14. 是当今DSL能力最强的语言

15. 很适合开发抛弃式程序

16. 或者快速打造原型系统

17. 跨越多个主流平台

18. 不可思议的简短代码示例

19. REBOL[]
View Layout [
Title "Hello"
Btn "OK" [
Quit
]
]
视窗程序居然这么简短

20. print read http://www.rebol.com
下载并打印某网页内容

21. 开启视窗、读取网页、邮寄出去
view layout [
u: field "user@rebol.com"
h: field "http://"
btn "Send" [
send to-email u/text
read to-url h/text
alert "Sent“
]
]

22. foreach file load %./ [
if not dir? file [
write/binary join
ftp://user:pass@example.com/
file
read/binary file
]
]
FTP上传所有文件

23. TCP端口扫描
repeat n 100 [
if not error? try [
close open probe
join tcp://localhost: n
] [
print [n "is open"]
]
]

24. remove-each tag page:
load/markup http://www.rebol.com
[ tag? Tag ]
write %page.txt page
将网页存成文件

25. 数字钟
view layout [
origin 0
t: h1 red black (to string! now/time)
rate 1
feel [
engage: [
t/text: now/time
show t
]
]
]

26. view l: layout [
origin 0x0
b: box "Load" [
error? try [
b/image: i:
load first request-file
b/text: ""
l/size: b/size:
i/size show l
]
]
]
图片浏览器

27. REBOL把事情变简单!
1. 下载、更新，简单！
2. 安装，简单！
3. 不用依赖一堆文件，简单！
4. 编写代码，简单！
4. 移植到其他平台，简单！
5. 维护，简单！

28. When It Comes
to Programming,
Are You A
REBEL? [`rebl]
Stand up for Simplicity
and Flexibility, Against Software
Complexity and Software
Obesity , and Want to
Program with Fun.
Hay! You Got to Try Java
!!!

29. R E B O L S T A N D S
F O R E X A B A
L P S J N
A R E E G
T E D C U
I S T A
V S G
E I E
O
N

30. As A Java Programmer,
You Know Objects Already.

31. But Relative Expression?

32. Relative-Expression
=>
Context-Sensitive Code
can
• 助动词 / 能
• 名词 / 罐
• 动词 / 装罐

33. Carl Sassenrath,
The REBOL Creator

34. 3 Ways to Run REBOL Scripts
REBOL
REBOL REBOL Script
Script Script
REBOL REBOL
REBOL Interpreter
interactive
Interpreter
Interpreter
Operating System

35. Portable Scripts
REBOL Script
REBOL Interpreter REBOL Interpreter
Operating System Operating System

36. All In One, One For All
Windowing
Drawing
Networking
Database Accessing
Web Browser Plug-In
External Lib Interface

37. Data Types You Can Imagine
datatype value >> ? 1
1 is an integer
Int! 1
>> ? 3.1416
Decimal! 3.1416 3.1416 is a decimal
Char! #"A" >> ? #"A"
Logic! True #"A" is a char
>> ? True
String! "ABC" TRUE is a logic of value: true
>> Type? "ABC"
== string!

38. Data Types You Cannot Imagine
datatypeURL value
Email! jerry@abc.com
Percent! 32%
Tag! <IMG>
Date! 2009-7-21
Time! 18:00
File! %gdi32.dll
Tuple! 127.0.0.1
URL! http://www.abc.com/
. . . More . . .

39. REBOL Data Types (& Type Sets)
Char!
Scalar
Any-String
Number
Series Any-Type Any-Word
Any-Block Any-Function

40. // Pseudo-Code REBOL[]
// Include This and That View Layout [
// Declare This and That Title "Hello"
Btn "OK" [
// ... Quit
Class MyApp { ]
MyApp () { ]
// …
}
void action() {
System.quit();
}
void layout() {
Label title = new Label("Hello")
Button btn = new Button("OK");
btn.Click = action;
Window win = new Window();
win.add(btn);
win.add(btn);
win.show();
}

41. Parsing
Functions
Maintain
Literals Readable Abstraction Dialecting
Writeable GUI
Succinct Finance
Database
Bug-Free
...

43. REBOL Plug-ins
• Extends REBOL
• Are DLLs
• Can Be in C or REBOL
• Only in REBOL 3.0

44. REBOL in Web Server
• CGI (Common Gateway Interface)
• Fast-CGI
• Cheyenne Web Server (300 KB Only)
• REBOL Server Pages (RSP)

45. REBOL 3.0 Supports
• String is in Unicode. Unicode
• Both In Core and In View
• Will Support Multi CharSets

46. REBOL/Services (SOA Lite)
XML? Nah!
Dialects are Better.

47. REBOL/Code
• Talk to REBOL VM Directly
• With Great Performance
• REBOL Dialecting Technology

48. When to Use REBOL
Spider Dialect Text
Processing
Mobile Instance Artificial
Agent Messenger Intelligence