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##闭包的常见用法  
[ 'cat', 'dog', 'horse' ].each {|name| print name, " " }
  5.times {  print "*" }
  3.upto(6) {|i|  print i }	##3..6又一写法
  ('a'..'e').each {|char| print char }

##输出函数的格式字符串
printf("Number: %5.2f,\nString: %s\n", 1.23, "hello")

posted @ 2006-09-12 15:59 ivaneeo 阅读(279) | 评论 (0) | 编辑收藏

ruby code example(11)

#############################################
##闭包的一个用法
  animals = %w( ant bee cat dog elk )    # create an array
  animals.each {|animal| puts animal }   # iterate over the contents


#############################################

  def call_block
    puts "Start of method"
    yield					##执行传入的参数.这里为"In the block"
    yield
    puts "End of method"
  end

  call_block { puts "In the block" }

##############################################

posted @ 2006-09-12 15:52 ivaneeo 阅读(255) | 评论 (0) | 编辑收藏

ruby code example(10)

##块的用法
 { puts "Hello" }       # this is a block

  do                     ###
    club.enroll(person)    # and so is this
    person.socialize       #
  end                    ###

posted @ 2006-09-12 15:49 ivaneeo 阅读(238) | 评论 (0) | 编辑收藏

ruby code example(9)

line = "abc"
if line =~ /Perl|Python/	##匹配正则表达式
    puts "Scripting language mentioned: #{line}" 
end


  line.sub(/Perl/, 'Ruby')    # replace first 'Perl' with 'Ruby'
  line.gsub(/Python/, 'Ruby') # replace every 'Python' with 'Ruby'

posted @ 2006-09-12 15:29 ivaneeo 阅读(243) | 评论 (0) | 编辑收藏

ruby code example(8)

  histogram = Hash.new(0)	##给hash表设置默然值为0
  histogram['key1']
  histogram['key1'] = histogram['key1'] + 1
  histogram['key1']

######################################
##gets 从命令行出入的文件名得到的文件的每一行文本。
while line = gets
  puts line.downcase	##downcase全部转换成小写
end

posted @ 2006-09-12 15:22 ivaneeo 阅读(303) | 评论 (0) | 编辑收藏

ruby code example(7)

##数组
a = [ 'ant', 'bee', 'cat', 'dog', 'elk' ]
  a[0]
  a[3]
# this is the same:
  a = %w{ ant bee cat dog elk }
  a[0]
  a[3]

##hash表
 inst_section = {
    'cello'     => 'string',
    'clarinet'  => 'woodwind',
    'drum'      => 'percussion',
    'oboe'      => 'woodwind',
    'trumpet'   => 'brass',
    'violin'    => 'string'
  }

  inst_section['oboe']
  inst_section['cello']
  inst_section['bassoon']

posted @ 2006-09-12 15:10 ivaneeo 阅读(243) | 评论 (0) | 编辑收藏

ruby code example(6)

 a = [ 1, 'cat', 3.14 ]   # array with three elements
  # access the first element
  a[0]
  # set the third element
  a[2] = nil
  # dump out the array
  a

posted @ 2006-09-12 15:07 ivaneeo 阅读(214) | 评论 (0) | 编辑收藏

ruby code example(5)

  def say_goodnight(name)
    result = "Good night, #{name}"	##把变量name的值替换进字符串,ruby使用#{var}.
    return result
  end
  puts say_goodnight('Pa')
##########################################################

  def say_goodnight(name)
    result = "Good night, #{name.capitalize}" ##s.capitalize 第一个子母变为大写
								      ##s.capitalize!
							              ##Returns a copy of s with the first character converted to uppercase and the remainder to lowercase.
								      ##"fooBar".capitalize # => "Foobar"
  return result
  end
  puts say_goodnight('uncle')

##########################################################

$greeting = "Hello"        # $greeting is a global variable
@name     = "Prudence"     # @name is an instance variable
puts "#$greeting, #@name"

##########################################################
  def say_goodnight(name)	##不用使用return语句也可以返回
    "Good night, #{name}"
  end
  puts say_goodnight('Ma')

posted @ 2006-09-12 15:05 ivaneeo 阅读(275) | 评论 (0) | 编辑收藏

ruby code example(4)

 number = -123	#数字都有Math类的方法
 number = number.abs

posted @ 2006-09-12 14:53 ivaneeo 阅读(220) | 评论 (0) | 编辑收藏

ruby code example(3)

  song = 1
  sam = ""
  def sam.play(a)	#定义方法
    "duh dum, da dum de dum ..."
  end

  "gin joint".length	#所有都是以Object为root
  "Rick".index("c")
  -1942.abs
  sam.play(song)

posted @ 2006-09-12 14:50 ivaneeo 阅读(224) | 评论 (0) | 编辑收藏

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