SaitoWu

require 'open-uri'

img_url = "http://fffffffffffffffffffffffuuuuuuuuuuuuuuuuuuuuuu.com/big.jpg?im="

(1..1044).each do |x|
  n = '%.4d' % x + ".jpg"
  open(n, "wb").write(open(img_url+n).read)
end

SaitoWu

#0> non-block call

Thread.new do
  blahbla...
end

#1> 4 simple ways to call shell or cmd

`ps aux`

SaitoWu

#clone repl from github or download form http://neugierig.org/software/c-repl/ 

git clone https://github.com/martine/c-repl.git c-repl

#install dependencies

sudo apt-get install ghc6 gccxml libghc6-parsec-dev libghc6-mtl-dev \
                       libghc6-hunit-dev

sudo apt-get install gdb libexpat1-dev c2hs libreadline-dev

SaitoWu

def call_block
  puts "before call"
  yield
  yield
  puts "after call"
end

call_block{ puts "call" } #before call\ncall\ncall\nafter call

SaitoWu

#Person
class Person
end

#class method
class Person
  def self.address
    puts "hangzhou"
  end
end

SaitoWu

def block_new
  puts Proc.new.call
end

block_new{"hello"}

#slow practice
def herp_pass_block(&block)
  derp_call_block &block
end

SaitoWu

require 'mongoid'

Mongoid.configure do |config|
  name = "db"
  host = "localhost"
  config.master = Mongo::Connection.new.db(name)
  config.slaves = [
    Mongo::Connection.new(host, 27017, :slave_ok => false).db(name)
  ]
  config.persist_in_safe_mode = false

SaitoWu

#rubbish showoff

#libxslt is missing or libxml2
sudo apt-get install libxslt-dev libxml2-dev

gem install rmagick

#Can't find Magick-config or GraphicsMag ick-config program.
sudo apt-get install libmagick9-dev

SaitoWu

require 'fiber'

fib = Fiber.new do
  v = 0
  loop do
    v += 1
    Fiber.yield v
    v.times { print "-"}
    puts v
  end

SaitoWu

require 'twitter'

Twitter.configure do |config|
  config.consumer_key="8n30gzQJFwcexyrnbKFTqw"
  config.consumer_secret="tzwvlxUyENhFEvX2bj0mDevSSLCMVNjY1zhM2O2Z5E"
  config.oauth_token="34916016-Qph9S5HS2FyDcVIEYIraswexmYpBBRqnLoX6e1ncZ"
  config.oauth_token_secret="8nkOjeYUK3RO5bRySz3YIYYiOc4mPxjxZM8GVoHDs"
end

client = Twitter::Client.new