《Falcon 初印象》幻灯分享

《Falcon 初印象》幻灯分享
http://laiyonghao.com

今天（五月三日）下午，与@qichangxing,@phaytsukiming,@heyFluke,@linluxiang,@vonbo,@qingliangcn,@benky52 等约13人在广州红专厂艺术区的黑胶咖啡馆聚会。大家可以通过 #GZTechParty 这个 tag 在 twitter 上看这个过程。

我做了个小演讲，跟大家介绍了一下 Falcon 这一门小众的编程语言，以下是分享的 PPT。

发表发现 csdn blog 还是不能显示 swf，请大家跳转到这里查看幻灯。

以下是大纲

====================================
1. Falcon 初印象赖勇浩 2010.5.3
2. 特性
  - 开源
  - 简单
  - 快速
  - 强大
3. 我最讨厌 python 的 GIL
  - Falcon 完全支持多线程编程
  - 每条线程都运行在一个单独的 VM 上
4. 我最讨厌 python 不支持协程
  - 不完全支持
  - Falcon 支持
5. 大家都讨厌 python 的速度
  - Falcon 要快得多
  - Raw VM loop speed：1023
  - Python：442|340
  - Lua：1247
  - Raw VM loop speed
  - int a = 0;
  - for( int i = 0; i < 100000000; i++ ) a = a + 1;
6. 第一行代码
  - number = 0
  - 数 = 0
7. stdout
  - print
  - printl
  - >>
  - >
8. if/elif/else 语句
  - if expression
  - statements...
  - elif expression
  - statements...
  - elif expression
  - statements...
  - /* other elifs */
  - else
  - statements...
  - end
9. 逻辑操作符
  - and
  - or
  - not
  - not 优先级最高
10. 三元表达式
  - <condition> ? <if true> [ : <if false>]
11. switch 语句
  - switch expression
  - case item [, item, .. item ]
  - statements...
  - case item [, item, .. item ]
  - statements...
  - /* other cases */
  - default
  - statements...
  - end
12. - print( "Enter your age: >" )
  - age = int( input() )
  - switch age
  - case 1 to 5
  - printl( "You are too young to program. Maybe." )
  - case 6, 7, 8
  - printl( "You may already be a great Falcon programmer." )
  - case 9, 10
  - printl( "You are ready to become a programmer." )
  - default
  - printl( "What are you waiting for? Start programming NOW" )
  - end
13. - switch month
  - case nil
  - > "Undefined"
  - case "Jan", "Feb", "Mar"(P43)
  - > "Winter"
  - case "Apr", "May", "Jun"
  - > "Spring"
  - case "Jul", "Aug", "Sep"
  - > "Summer"
  - default
  - > "Autumn"
  - end
14. 甚至是……
  - switch func
  - case print
  - printl( "It was a print !!!" )
  - case printl
  - printl( "It was a printl !!!" )
  - case MyObject
  - printl( "The value of func is the same of MyObject" )
  - end
15. select 语句
  - select variable
  - case TypeSpec
  - ...statements...
  - case TypeSpec1 , TypeSpec2 , ..., TypeSpecN
  - ...statements...
  - default
  - ...statements...
  - end
16. - select param
  - case IntegerType, NumericType
  - return "number"
  - case StringType: return "string"
  - case Test2: return "class test2"
  - case Test: return "class test"
  - case Instance: return "instance obj"
  - default : return "something else"
  - end
17. while 语句
  - while expression
  - statements...
  - [break]
  - statements...
  - [continue]
  - statements...
  - end
18. loop 语句
  - count = 0
  - loop
  - > ++ count
  - end count == 100
  - 哦，跟 do...while 语句一样……
19. for/in 循环
  - 嗯……其实很多语言都有……它的只是太强大了……
  - for variable[,variable...] in collection
  - ...statements...
  - [break | continue | continue dropping]
  - ...statements...
  - forfirst
  - ... first time only statements ...
  - end
  - formiddle
  - ... statements executed between element processing ...
  - end
  - forlast
  - ... last time only statements ...
  - end
  - end
20. continue dropping
  - array = [ 1, 2, 3, 4, 5 ]
  - for elem in array
  - if elem % 2 == 1
  - continue dropping
  - end
  - printl( "We accepted the even number: ", elem )
  - end
21. dot-assign
  - for elem in array
  - .= 0 // sets all the array elements to zero...
  - printl(elem) // ... but prints the original items
  - end
22. For/in ranges
  - for value in [1:10]
  - printl( value )
  - end
  - for value in [ 0: 11: 2 ]
  - > value
  - end
23. For/to loops
  - for variable = lowerbound to upperbound [, step]
  - // for/to body, same as for/in
  - end
  - for i = 1 to 10
  - forfirst: >> "Starting: "
  - >> i
  - formiddle: >> ", "
  - forlast: > "."
  - end
  - for i = 2 to 10, 2
  - > i
  - end
24. const
  - const name = immediate_value
25. enum
  - enum Seasons
  - spring
  - summer
  - autumn
  - winter
  - end
  - > Seasons.spring // 0
26. - enum Seasons
  - spring = 1 // 1
  - summer // 2
  - midsummer = "So hot..." // "So hot..."
  - endsummer // 3 (string skipped)
  - autumn = 10.12 // 10.12
  - winter // 11
  - end
27. 基本数据类型
  - Array
  - String
  - Dictionary
  - List
28. Array
  - array = ["person", 1, 3.5, int( "123" ), var1 ]
  - array = "person", 1, 3.5, int( "123" ), var1
  - a2 = .[ 1 2 3 4 'a' 'b' var1 + var2 var3 * var4 .[x y z]]
  - a, b, c = 1, 2, 3
  - array = 1, 2, 3
  - a, b, c = array
29. range
  - R=[n : m] means "all items from n to m-1"
30. String
  - string = "Hello world"
  - longString = "
  - Aye, matey, this is a very long string.
  - Let me tell you about my remembering
  - of when men were men, women were women,
  - and life was so great.“
  - iStr = '
  - 国際ストリング
  - 国際ストリング
  - ‘
  - > 'Hello ''quoted'' world!' // Will print "Hello 'quoted' world"
  - 基础特性跟 C 字符串相似
31. String replication
  - sep = "-~*~-" * 12
  - > sep
  - > " "*25 + "Hello there!"
  - > sep
32. String-to-number concatenation
  - string = "Value: " + 100
  - > string // prints "Value: 100"
  - string = "Value: " % 64
  - > string // prints "Value: A"
  - string %= 0x3B2
  - > string // "Value: Aβ"
  - d_letter = "a" / 3 // chr( ord('a') + 3) == 'd'
  - a_letter = d_letter / -3 // chr( ord('d') - 3) == 'a'
  - > a_letter, ", ", d_letter
33. String expansion operator
  - value = 1000
  - printl( @ "Value is $value" )
  - array = [ 100, 200, 300 ]
  - printl( @ "Array is $array[0], $array[1], $array[2]" )
  - printl( @ "The selected value is $(array[ value ])." )
  - dict = [ "a" => 1, "b" => 2]
  - > @ "A is $(dict['a']), and B is $(dict["b"])"
34. Dictionary
  - dict = [ => ] // creates an empty dictionary
  - dict = [ "a" => 123, "b" => "onetwothree" ]
  - printl( dict["a"] ,":", dict["b"] ) // 123:onetwothree
  - a = [ 1=>'1', 2=>'2', "alpha"=>0, "beta"=>1 ]
35. List
  - deque
  - 高效的两端操作
  - l = List( "a", "b", "c" )
  - > "Elements in list: ", l.len()
  - > "First element: ", l.front()
  - > "Last element: ", l.back()
  - l.pushFront( "newFront" )
  - > "New first element: ", l.front()
  - l.push( "newBack" )
  - > "New first element: ", l.back()
  - l.popFront()
  - l.pop()
  - > "Element count now: ", l.len()
36. in/notin
  - name = input()
  - if "abba" in name
  - printl( "Your name contains a famous pop group name" )
  - end
  - dict = [ "one" => 1 ]
  - if "one" in dict
  - printl( "always true" )
  - end
  - if "abba" notin name
  - printl( "Your name does not contain a famous pop group name" )
  - end
37. Memory buffers
  - memory = MemBuf( 5, 2 ) // creates a table of 5 elements, each 2 bytes long.
  - for value in [0:5]
  - memory[ value ] = value * 256
  - end
38. Bitwise operators
  - &&
  - ||
  - ^^
  - ~
  - <<
  - >>
  - &= |= ^=
  - <<= >>=
39. - value = 0x1 || 0x2 // or bits 0 and 1
  - // display binary:
  - > @"$(value:b)b = $(value:X)H = $value"
  - value = value && 0x1 // turns off bit 2
  - > @"$(value:b)b = $(value:X)H = $value"
  - value = ~value && 0xFFFF // Shows first 2 bytes of reversed value
  - > @"$(value:b)b = $(value:X)H = $value"
  - value = value ^^ 0x3 // turns off bit 2 and on bit 1
  - > @"$(value:b)b = $(value:X)H = $value"
40. 函数
  - function do_something( parameter )
  - printl( "Hey, this is a function saying: ", parameter )
  - end
  - return nil
41. - function square( x )
  - y = x * x
  - return y
  - end
42. 递归
  - function sum_of_first( x )
  - if x > 1
  - return x + sum_of_first( x - 1 )
  - end
  - return x
  - end
43. Local and global variable names
  - sqr = 1.41
  - function square( x )
  - printl( "sqr was: ", sqr )
  - sqr = x * x
  - return sqr
  - end
  - number = square( 8 ) * sqr
  - function square_in_z( x )
  - global z
  - z = x * x
  - end
  - z = 0
  - square_in_z( 8 )
  - printl( z ) // 64
44. - function say_something()
  - static
  - data = [ "have", "a", "nice", "day" ]
  - current = 0
  - end
  - if current == len( data )
  - return
  - end
  - element = data[current]
  - current += 1
  - return element
  - end
45. Anonymous and nested functions
  - innerfunc
  - var = innerfunc ( [param1, param2, ..., paramN] )
  - [static block]
  - [statements]
  - end
  - square = innerfunc ( a )
  - return a * a
  - end
  - printl( "Square of 10: ", square( 10 ) )
46. Function closure
  - function keyword
  - function makeMultiplier( operand )
  - multiplier = function( value )
  - return value * operand
  - end
  - return multiplier
  - end
  - m2 = makeMultiplier( 2 ) // ... by 2
  - > m2( 100 ) // will be 200
  - m4 = makeMultiplier( 4 ) // ... by 4
  - > m4( 100 ) // will be 400
47. Codeblocks
  - 匿名函数的语法糖
  - lambda 表达式
  - block = { [p1, p2..., pn] => expression }
  - // or
  - block = { [p1, p2..., pn] =>
  - statement
  - ...
  - }
  - printl( {a, b => a + b}(2,2) )
48. Callable arrays
  - array 的第一个元素是函数，即为 callable array
  - printl( "Hello world" )
  - [printl]( "Hello world" )
  - [printl, "Hello"]( " world" )
  - [printl, "Hello", " ", "world"]()
  - i = 0
  - icall = .[printl $i ": "]
  - for i in [0:10]: icall( "Looping..." )
49. Accessing the calling context
  - fself keyword
  - caller keyword
  - function recurse( val )
  - if val <= 0: return 1
  - > recurse.caller(), ":", val // or fself.caller()
  - return recurse( val-1 ) + val
  - end
  - recurse( 5 )
50. Non positional parameters
  - function f( alpha, beta, gamma )
  - > @"alpha: $alpha"
  - > @"beta : $beta"
  - > @"gamma: $gamma"
  - end
  - f( gamma| "a" + "b" + "c", beta|"b-value" )
51. - future bindings
  - future_beta = beta|"b-value"
  - future_gamma = lbind( "gamma", "a" + "b" + "c" )
  - f( future_gamma, future_beta )
  - The lbind function can create late and future bindings;
  - f( non_existing|"value" ) // raises an error!
52. object
  - object object_name [ from class1, class2 ... classN]
  - property_1 = expression
  - property_2 = expression
  - ...
  - property_N = expression
  - [init block]
  - function method_1( [parameter_list] )
  - [method_body]
  - end
  - ...
  - function method_N( [parameter_list] )
  - [method_body]
  - end
  - end
53. object 就是单件模式？
54. class
  - class class_name[ ( param_list ) ] [ from inh1[, inh2, ..., inhN] ]
  - [ static block ]
  - [ properties declaration ]
  - [init block]
  - [method list]
  - end
55. - class mailbox( max_msg )
  - capacity = max_msg * 10
  - name = nil
  - messages = []
  - init
  - printl( "Box now ready for ", self.capacity, " messages." )
  - end
  - function slot_left()
  - return self.max_msg - len( self.messages )
  - end
  - end
56. Property accessors
  - __set_propname/__get_propname
  - class Series( values )
  - values = values
  - function __get_mean()
  - sum = 0
  - for i in self.values: sum += i
  - return sum / self.values.len()
  - end
  - end
  - s = Series( [14,53,18,8] )
  - > "The mean is: ", s.mean // 23.25
57. - class parent1( p )
  - end
  - class parent2( p )
  - end
  - class child(p1, p2) from parent1( p1 ), parent2( p2 )
  - init
  - > "Initializing child with ", p1, " and ", p2
  - end
  - end
  - instance = child( "First", "Second" )
58. Private members
  - _
  - object privateer
  - _private = 0
  - function getPrivate(): return self._private
  - function setPrivate(value): self._private = value
  - end
59. Operator overloading
  - class OverPlus( initValue )
  - numval = initValue
  - function add__( operand )
  - return OverPlus( self.numval + operand )
  - end
  - end
  - op = OverPlus( 10 )
  - nop = op + 10
  - > nop.numval //: 20
60. Comparison overloading
  - Comparison operators, namely <, >, <=, >=, == and != all refer to the same overloaded method: compare.
  - 没有 __ 结尾
  - class CmpOver( val )
  - number = val
  - function compare( oper )
  - if oper provides number
  - return self.number - oper.number
  - elif oper.typeId() == NumericType or oper.typeId() == IntegerType
  - return self.number - oper
  - end
  - return nil
  - end
  - end
  - ten = CmpOver( 10 )
  - > "Is ten > 5? ", ten > 5
  - > "Is ten != 3? ", ten != 3
  - > "Is ten <= 10? ", ten <= 10
  - > "Is ten > an array? ", ten > [1,2,3]
61. Subscript overloading
  - []
  - getIndex__
  - setIndex__
62. Automatic string conversion
  - toString method
63. Error recovery
  - try
  - [try statements]
  - [ catch [object_type] [ in error_variable] ]
  - [ catch statements ]
  - end
  - raise keyword
64. Thank you!
  - @laiyonghao
  - http://laiyonghao.com
相关阅读:
nput keyup 500ms 延时输入事件处理
 browser-sync默认地址如何转成127.0.0.1
overflow:scroll-css知识备忘
 圆角的css样式
 支付宝开发
 C#代码与javaScript函数的相互调用
 高性能web开发如何加载JS，JS应该放在什么位置？
Makefile自动生成头文件依赖
 一步步教你如何写Makefile
（一）：U-BOOT启动分析--概述
原文地址：https://www.cnblogs.com/aiwz/p/6154368.html