voldy

Useful Spacemacs commands

• SPC q q - quit
• SPC w / - split window vertically
• SPC w - - split window horizontally
• SPC 1 - switch to window 1
• SPC 2 - switch to window 2
• SPC w c - delete current window
• SPC TAB - switch to previous buffer
• SPC b b - switch buffers

voldy

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

voldy

#!/bin/bash -e

IFADDR="192.168.3.1/24"

if [[ ! ip link show docker0 ]]; then
  ip link add docker0 type bridge
  ip addr add "$IFADDR" dev docker0
  ip link set docker0 up
  iptables -t nat -A POSTROUTING -s "$IFADDR" ! -d "$IFADDR" -j MASQUERADE
fi

voldy

http://tech.pristine.io/android-unit-test-idioms/
http://touk.pl/blog/pl/2014/02/26/mock-retrofit-using-dagger-and-mockito/
https://software.intel.com/en-us/videos/test-driven-development-and-android-testing-by-christopher-perry-and-marcelo-bay-area-android 
(http://uds.ak.o.brightcove.com/740838651001/740838651001_3482875046001_Android-Fest-Chris-and-Marcello-4-12-14.mp4)
https://www.reddit.com/r/androiddev/comments/2mebor/testing_retrofit_observable_with_robolectric/
http://www.slideshare.net/godfreynolan/android-tdd-41783654
http://code.tutsplus.com/tutorials/dependency-injection-with-dagger-2-on-android--
cms-23345
http://code.tutsplus.com/tutorials/quick-tip-using-butter-knife-to-inject-views-on-android--cms-23542
http://square.github.io/ (author of retrofit, dagger)

voldy

(global-set-key (kbd "C-c p f") 'projectile-find-file)
(global-set-key (kbd "C-c p F") 'projectile-find-file-other-window)
(global-set-key (kbd "C-c p d") 'projectile-find-dir)
(global-set-key (kbd "C-c p D") 'projectile-find-dir-other-window)
(global-set-key (kbd "C-c C-c d") 'projectile-dired)
(global-set-key (kbd "C-c p b") 'projectile-switch-to-buffer)
(global-set-key (kbd "C-c p a") 'projectile-ag)
(global-set-key (kbd "C-c p i") 'projectile-invalidate-cache)
(global-set-key (kbd "C-c p k") 'projectile-kill-buffers)
(global-set-key (kbd "C-c p p") 'projectile-switch-project)

voldy

require 'net/http'
require 'xmlsimple'
url = "http://www.user-agents.org/allagents.xml"
xml_data = Net::HTTP.get_response(URI.parse(url)).body
data = XmlSimple.xml_in(xml_data)
agents = data['user-agent'].select{|agent| type = agent["Type"].first; type.include?("R") || type.include?("S")}
agent_names = agents.collect {|agent| agent["String"].first}

voldy

# /etc/init/project-web-reload.conf

pre-start script
  initctl restart project-web
  sleep 15
end script

exec /usr/local/rvm/bin/default_bluepill restart

voldy

Ruby on Rails best practices

Code style

• Use UTF-8. It’s 21 century, 8bit encodings dead now.
• Use 2 space indent, not tabs
• Use Unix-style line endings
• Keep lines not longer than 80 chars
• Remove trailing whitespace

voldy

!!! 5
%html
  %head
    %title= "Your Website"
    %meta{ :content => "", :name => "description" }
    %meta{ :content => "", :name => "author" }
    %meta{ :content => "3 days", :name => "revisit-after" }
    %link{ :href => "http://creativecommons.org/licenses/by/3.0/", :rel => "license", :title => "Creative Commons Attribution 3.0 Unported License" }
    %link{ :href => "/feed", :rel => "alternate", :title => "Atom", :type => "application/atom+xml" }
    %link{ :href => "/css/screen.css", :media => "screen", :rel => "stylesheet" }

voldy

# Use the config/mongoid/#{rails_env}.yml file for mongoid config

namespace :mongoid do
  desc "Copy mongoid config"
  task :copy do
    upload "config/mongoid/#{rails_env}.yml", "#{shared_path}/mongoid.yml", :via => :scp
  end

  desc "Link the mongoid config in the release_path"
  task :symlink do