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Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

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User.where(gender: 'M').or("age > 22")
#SELECT "users".* FROM "users" WHERE ("users"."gender" = ? OR "users"."age" > ?)  [["gender", 'M'], ["age", "22"]]

User.where(gender: 'M').or(user.where("age > 22"))
#SELECT "users".* FROM "users" WHERE ("users"."gender" = ? OR "users"."age" > ?)  [["gender", 'M'], ["age", "22"]]

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$(function(){

	// add multiple select / deselect functionality
	$("#selectall").click(function () {
		  $('.case').attr('checked', this.checked);
	});

	// if all checkbox are selected, check the selectall checkbox
	// and viceversa
	$(".case").click(function(){

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API workthough

1. Open a browser

   # start an instance of firefox with selenium-webdriver
   driver = Selenium::WebDriver.for :firefox
   # :chrome -> chrome
   # :ie     -> iexplore
   

• Go to a specified URL

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Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "your_email@youremail.com"

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<%= form_for(@user) do |f| %>
<div class="user_container">
 
    <%= f.label :intrests %>
    <ul>
	<% Interest.all.each do |interest| %>
	  <li>
	  <label class="li">
	         <%= check_box_tag :intrest_ids, intrest.id, @user.interests.include?(interest), :name => 'user[intrest_ids][]' %> <u><%= intrest.title %></u>
	  </label>

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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$ rails r 'File.write("./viz.html", Rails.application.routes.router.visualizer)'
$ ruby -r webrick -e "s = WEBrick::HTTPServer.new(:Port => 8080, :DocumentRoot => Dir.pwd); trap('INT') { s.shutdown }; s.start"
$ open "http://localhost:8080/viz.html"

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#!/bin/sh
### BEGIN INIT INFO
# Provides:          unicorn
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Manage unicorn server
# Description:       Start, stop, restart unicorn server for a specific application.
### END INIT INFO

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#!/bin/sh
set -e
# Example init script, this can be used with nginx, too,
# since nginx and unicorn accept the same signals

# Feel free to change any of the following variables for your app:
TIMEOUT=${TIMEOUT-60}
APP_ROOT=/path/to/your/app/current
PID=$APP_ROOT/tmp/pids/unicorn.pid
ENVIRONMENT=production