ruby入门

ruby入门

Ruby API查询
Ruby 正则表达式查询

ruby技巧

字符串转数组

s = "a=1&b=2"
a = s.split(/&|=/)
#["a", "1", "b", "2"]

数组转为哈希

a = ["a", "1", "b", "2"]
#*号可以将数组中的字符串展开
Hash[*a]
#{"a"=>"1", "b"=>"2"}

char的ASCII值

#ASCII值转为char
120.chr
#char转为ASCII值
'x'[0]
#查看字符串的ASCII值
"love".chars.map{|c| c[0]}

字符编码转换

require 'iconv'
#conv(to, from, str)
Iconv.conv('gb2312', 'utf-8', '中国')

Iconv

split

'Café périferôl'.mb_chars.split(/é/).map { |part| part.upcase.to_s } #=> ["CAF", " P", "RIFERÔL"]

slice! (*args)

 s = 'こんにちは'
 s.mb_chars.slice!(2..3).to_s #=> "にち"
 s #=> "こんは"

strip ()

'happy'.strip
#=>"happy"

mb_chars

  name = 'Claus Müller'
  name.reverse  #=> "rell??M sualC"
  name.length   #=> 13

  name.mb_chars.reverse.to_s   #=> "rellüM sualC"
  name.mb_chars.length         #=> 12

strftime

  DateTime.now.strftime
=> "2010-10-12T09:51:36+08:00"

Date.today.strftime
=> "2010-10-12"

time

?> Time.now.sec
=> 39
>> 
?> Time.now.min
=> 55
>> 
?> Time.now.hour
=> 9
>> 
?> Time.now.day
=> 12
>> Time.now.mon
=> 10
>> 
?> Time.now.year
=> 2010
>> 
?> Time.now.wday
=> 2
>> 
?> Time.now.yday
=> 285

to_a、to_f、to_datetime、to_i、to_s