Ruby – Variables
November 12, 2009
Scenario 1: Local variable
class Ordin
def first
a=10
puts a
end
def second
puts a
end
end
obj=Ordin.new
obj.first
obj.second
output:
variable_explanation.rb:11:in `second’: undefined local variable or method `a’ for #<Ordin:0xb7d3c5e0> (NameError)
from variable_explanation.rb:17
10
Description:
a –> works only inside of first method
———————————————-
Scenario 2: Method variable
class Metho
def first
@a=10
puts “#{@a} from first method”
end
def second
puts “#{@a} from second method”
end
end
obj=Metho.new
obj.first
obj.second
output:
10 from first method
10 from second method
———————————————-
Scenario 3: Class Variable
class One
@@a=10
def first
puts “#{@@a=@@a+3} from first method”
end
def second
puts “#{@@a} from second method”
end
end
class Two < One
def third
puts @@a
end
end
obj=Two.new
obj.third
Ouput:
10
———————————————-
Scenario 4: Global Variable
class One
$a=10
def first
puts “#{$a} from first method”
end
def second
puts “#{$a} from second method”
end
end
class Two
def third
puts $a
end
end
obj=Two.new
obj.third
Ouput:
10
———————————————-
Ruby – Scrap the content from HTML Source
November 3, 2009
CODE.rb
code=’<html>
<head>
<title>title</title>
<meta content=”title” name=”keywords”/>
<meta content=”text/html; charset=iso-8859-1″ http-equiv=”Content-
Type”/>’
puts content= code.scan(%r{content=”(.*?)”}im).flatten[0].to_s
puts name=code.scan(%r{name=”(.*?)”}im).flatten.to_s
Output:
title
keywords
Ruby – Get ASCII value
October 30, 2009
Example 1:
puts ?r #=> 114
puts ?a #=> 97
Example 2:
output=”raveendran”
puts output[0] #=>114 ‘value of r’
puts output[1] #=> 97 ‘value of a’
Example 3:
output=”raveendran”
output.each_byte do |a|
puts a
end
>ruby ascii_from_ruby.rb
114
97
118
101
101
110
100
114
97
110
>Exit code: 0
Watir – handling hidden process in windows
October 30, 2009
Code:
def running(a)
running=`tasklist`
if running.include?(a)
puts “#{a} is already running in windows machine”
else
puts “#{a} is not running”
end
end
runnning(‘java.exe’)
#=> java.exe is already running in windows machine
runnning(‘notepad.exe’)
#=> notepad.exe is not running
Where this code will useful:
We can able to chaeck the process is runnign or not — When Script need to close some opened Firefox windows or chrome windows
Ruby – Identifying opened applications in windows machine
October 28, 2009
Code
require ‘rubygems’
require ‘win32ole’
def window_name_opened(name)
w=WIN32OLE.new(‘WScript.Shell’)
output=w. AppActivate(name)
puts output
end
window_name_opened(‘notepad’)
#=> false
Step 2 –> Now open one note pad and run the ruby program again it should returns TRUE
Joker – Ruby gem
September 10, 2009
Joker – Ruby gem
Good Alternate for Regular expressions
require ‘rubygems’
require ‘joker’
wild = Wildcard['Fairy?ake*']
puts wild =~ ‘Fairycake’ #=> true
puts wild =~ ‘Fairyfakes’ #=> true
puts wild =~ ‘Fairylake is a cool place’ #=> true
puts wild =~ ‘Dairycake’ #=> false
puts wild =~ ‘Fairysteakes’ #=> false
puts wild =~ ‘fairycake’ #=> false
puts wildi = Wildcard['Fairy?ake*\?', true]
puts wildi =~ ‘FairyCake?’ #=> true
puts wildi =~ ‘fairyfakes?’ #=> true
puts wildi =~ ‘FairyLake IS A COOL Place?’ #=> true
Wildcard.quote(‘*?\\’) #=> ‘\\*\\?\\\\’
For more details about this gem –> http://bit.ly/L9kcg
Ruby – Read/Write ProxyServer details in Windows registry
August 18, 2009
Ruby – Read/Write ProxyServer details in Windows registry
Code:
require ‘win32/registry’
def get_proxy
path = ‘Software\Microsoft\Windows\CurrentVersion\Internet Settings’
type, value = Win32::Registry::HKEY_CURRENT_USER.open(path).read (‘ProxyServer’)
puts value
end
def set_proxy
path = ‘Software\Microsoft\Windows\CurrentVersion\Internet Settings’
name=’ProxyServer’
data=’socks=34.12.78.92:54323′
type=1
Win32::Registry::HKEY_CURRENT_USER.open (path,Win32::Registry::KEY_WRITE).write(name,type,data)
end
get_proxy
set_proxy
get_proxy
Output:
socks=68.42.78.102:56773
socks=34.12.78.92:54323
Random names in Ruby
August 1, 2009
Code:
def rando
letter=(“a”..”z”).to_a
return @name=
letter[rand(letter.length)]+”#{rand(9)}”+letter[rand(letter.length)]+
letter[rand(letter.length)]+letter[rand(letter.length)]+”# {rand(9)}”+letter[rand(letter.length)]+
letter[rand(letter.length)]+”# {rand(9)}”+letter[rand(letter.length)]+letter[rand(letter.length)]+
letter[rand(letter.length)]+letter[rand(letter.length)]+”#{rand(9)}”
end
rando
puts @name
Output:
o1epp7yn0clbk4
Ruby Highline – Examples
August 1, 2009
Examples
Basic usage:
ask("Company? ") { |q| q.default = "none" }
Validation:
ask("Age? ", Integer) { |q| q.in = 0..105 }
ask("Name? (last, first) ")
{ |q| q.validate = /\A\w+, ?\w+\Z/ }
Type conversion for answers:
ask("Birthday? ", Date)
ask("Interests? (comma sep list) ",
lambda { |str| str.split(/,\s*/) })
Reading passwords:
ask("Enter your password: ") { |q| q.echo = false }
ask("Enter your password: ") { |q| q.echo = "x" }
ERb based output (with HighLine‘s ANSI color tools):
say("This should be <%= color('bold', BOLD) %>!")
Menus:
choose do |menu|
menu.prompt = "Please choose your favorite
programming language? "
menu.choice(:ruby) { say("Good choice!") }
menu.choices(:python, :perl)
{ say("Not from around here, are you?") }
end
Reference --> http://highline.rubyforge.org/doc/
Ruby – convert number to english word
May 29, 2009
Ruby - convert number to english word
CODE :
class Fixnum
def english_word
@h = {0=>"zero", 1=>"One", 2=>"Two", 3=>"Three",
4=>"Four", 5=>"Five",6=>"six", 7=>"seven", 8=>"Eight",
9=>"Nine",10=>"Ten",11=>"Eleven",12=>"Twelve",
13=>"Thirteen",14=>"Fourteen",15=>"Fifteen",
16=>"Sixteen",17=>"Seventeen",18=>"Eighteen",
19=>"Nineteen",20=>"Twenty",30=>"Thirty",
40=>"Fourty",50=>"Fifty",60=>"Sixty",70=>"Seventy",
80=>"Eighty",90=>"Ninty"}
@i=0
@array=[]
@result=""a
if self > 99
str_num=self.to_s #@num.to_s
str_num_len=str_num.length
str_full_num=str_num.insert(0,"0"*(11-str_num_len))
str_full_num=str_num.insert(8,"0")
str_full_num.scan(/../) { |x| @array<<x }
6.times do
self.def_calc
@i+=1
end
else
if self > 9
puts
(self.proc_double_dig((self/10)*10))+
(self.proc_single_dig(self%10))
else
if self > 0
puts self.proc_single_dig(self)
else
return "AMOUNT NOT KNOWN or NILL"
end
end
end
end
def def_calc
case @i
when 0
str=self.proc_unit(@array[@i])
if (str.scan(/\w+/)).length!=0
then str=str+ "hundred & "
@result=@result+str
end
when 1
str=self.proc_unit(@array[@i])
if (str.scan(/\w+/)).length!=0
then str=str+ " Crore, "
@result=@result+str
end
when 2
str=self.proc_unit(@array[@i])
if (str.scan(/\w+/)).length!=0
then str=str+ " Lakh, "
@result=@result+str
end
when 3
str=self.proc_unit(@array[@i])
if (str.scan(/\w+/)).length!=0
then str=str+ " Thousand, "
@result=@result+str
end
when 4
str=self.proc_unit(@array[@i])
if (str.scan(/\w+/)).length!=0
then str=str+ " Hundred, "
@result=@result+str
end
when 5
str=self.proc_unit(@array[@i])
if (str.scan(/\w+/)).length!=0
then str=str+ ". "
@result=@result+str
end
print @result.sub(/..$/,"")
else
end
end
def proc_unit(x)
if x.to_i>0
if x.to_i<=10
return self.proc_single_dig(x.to_i)
else
if x.to_i<=20
return self.proc_double_dig(x.to_i)
else
return
(self.proc_double_dig((x.to_i/10)*10))+
(self.proc_single_dig(x.to_i%10))
end
end
end
return ""
end
def proc_double_dig(z)
if z==0
return ""
else
return @h[z]
end
end
def proc_single_dig(y)
if y==0
return ""
else
return @h[y]
end
end
protected :def_calc, :proc_unit, :proc_double_dig,
:proc_single_dig
end
puts 453645445.english_word
#FourtyFive Crore, Thirtysix Lakh, FourtyFive Thousand,
Four Hundred,FourtyFive
Note:
The above code works only up to billions.
