Karim Tarek karimmtarek

#Ruby Interview Questions

What are blocks for?

Plain old english: Ways of grouping code we want to run. The simplest explanation for a block is that it is a chunk of code between {} or do...end, that can't be stored in a variable and isn't an object. A block is just part of the syntax of a method call. It doesn’t mean anything on a standalone basis and can only appear in argument lists.

What are the difference between `p` and `puts`?

The difference is subtle, but p prints the true value of an object, rather than a string-ified version of the object. This will make more sense soon, but for the sake of simplicity, we'll use the p command throughout the exercises, as we'll want to see the true values of our code returned to the output window.

#Ruby on Rails Interview Questions

What is CSRF and how do you prevent it?

What are strong parameters introduced in Rails 4 and what is the reasoning behind the change?

Explain how you test your Rails app. Explain the various test levels available out of the box (controllers/integration/mailers/models).

What is a Rails engine?

What are different ways you could modularize a huge Rails app?

What code would you put in `app/controllers/concern`?

What does “keep your controllers thin and your models fat” mean?

How would you remove logic from your views?

When would you use a class vs instance variables in RoR ?

Dynamic Dispatch
Dynamic Method
Ghost Methods
Dynamic Proxies
Blank Slate
Kernel Method
Flattening the Scope (aka Nested Lexical Scopes)
Context Probe
Class Eval (not really a 'spell' more just a demonstration of its usage)
Class Macros

#Goal Deploy your Rails App super easily with Dokku on Digital Ocean cheap cheap!

##Notes

Follow 12 factor design (include the rails_12factor gem)
Don't forget your Procfile with the command to start up your application server
I prefer using external hosted logging services like Logentries (not in this guide)
Set up performance monitoring AppSignal or New Relic (not in this guide)

	# Hauleth's Rails app template

	# Sass helpers and nicer views
	gem 'autoprefixer-rails'

	# Faster HTML escaping
	gem 'escape_utils'

	# Translations
	gem 'r18n-rails'

	Lesson 1 SUMMARY

	1. The cursor is moved using either the arrow keys or the hjkl keys.
	h (left) j (down) k (up) l (right)

	2. To start Vim from the shell prompt type: vim FILENAME <ENTER>

	3. To exit Vim type: <ESC> :q! <ENTER> to trash all changes.
	OR type: <ESC> :wq <ENTER> to save the changes.

	unbind C-b
	set -g prefix C-s

	# $Id: h-boetes.conf,v 1.2 2009-10-25 21:45:26 nicm Exp $
	#
	# From Han Boetes.

	set -g default-command zsh
	set -g status-right "#(uptime\|awk '{print $11}') #(date)"

	set nocompatible " be iMproved, required
	filetype off " required

	" set the runtime path to include Vundle and initialize
	set rtp+=~/.vim/bundle/Vundle.vim
	call vundle#begin()
	" alternatively, pass a path where Vundle should install plugins
	"call vundle#begin('~/some/path/here')

	" let Vundle manage Vundle, required

	# First install tmux
	brew install tmux

	# For mouse support (for switching panes and windows)
	# Only needed if you are using Terminal.app (iTerm has mouse support)
	Install http://www.culater.net/software/SIMBL/SIMBL.php
	Then install https://bitheap.org/mouseterm/

	# More on mouse support http://floriancrouzat.net/2010/07/run-tmux-with-mouse-support-in-mac-os-x-terminal-app/

	# Ways to execute a shell script in Ruby
	# Example Script - Joseph Pecoraro

	cmd = "echo 'hi'" # Sample string that can be used

	# 1. Kernel#` - commonly called backticks - `cmd`
	# This is like many other languages, including bash, PHP, and Perl
	# Returns the result of the shell command
	# Docs: http://ruby-doc.org/core/classes/Kernel.html#M001111