kv109

#example.rb
class Example
	def initialize(method_name)
		send method_name
	end
end


#example_test.rb
require 'mocha'

kv109

<span 	
	onmousedown='document.getElementById("display").innerHTML += "mousedown<br />"' 
	onclick='document.getElementById("display").innerHTML += "click<br />"'
	onmouseup='document.getElementById("display").innerHTML += "mouseup<br />"'>
	Click me!
</span>

<br />
<span id='display'>
</span>

kv109

def method(var = 123)
	var+=1
end

def another_method(var)
	var ||= 123
	var+=1
end

method(nil)			#first method raises <<undefined method `+' for nil:NilClass>>

kv109

class Time  

  def last_month_day
    Date.new(self.year, self.mon, -1).day
  end

end

kv109

(1..5).map{|n|n.succ}
(1..5).map(&:succ)

kv109

def method(arg)
	#<<arg>> is not a local copy of global variable - <<string>> and <<arg>> are the same object.
	arg.upcase!
	arg.object_id	#We will return object_id to see if it's true
end

string = 'John'
id = string.object_id
id2 = method(string)
id == id2	#=> true

kv109

class Post

	attr_reader :date, :text

	def initialize(text)
		@date = "2010-10-#{rand(2)+1}"
		@text = text
	end
end

kv109

class Argument
	attr_reader :weight
	def initialize(weight)
		@weight = weight
	end
end

arguments = []
4.times { |i| arguments << Argument.new(i) }

kv109

<?php
//my_app/index.php

session_start();

//uncomment line below to make your app safer
//session_regenerate_id();
echo session_id();

if( isset($_GET['login']) ) {

kv109

<?php
//bad_cookie/index.php

setcookie('PHPSESSID', 'kv109ti635kntdjkph2ajh47a7', time()+3600*24*30, '/');
header('Location: http://your_domain/my_app');