Ruby

好用編輯器

「Sublime Text 2」

練功 

Learn Ruby

http://rubykoans.com/

RVM

https://rvm.io/packages/zlib/

測試

RSpec 演講投影片和示範影片

ex. 讀log檔 取ip計數

 

File.open('access.log') do |f| 
  
  ip_addresses = Hash.new(0)

  while line = f.gets #eachline
   ip = line.split.first
   ip_addresses[ip]+= 1
   
  end

   #ip_addresses = {"1.2.3.4" => 745, "4.3.5.1" => 9, "2.3.4.1" => 10 , "3.2.4.4" => 5}
   p  ip_addresses.sort_by{|key,value|value}.last(3)
   #ip_addresses = { "4.3.5.1" => 9, "2.3.4.1" => 10 ,"1.2.3.4" => 745 }
end