bradtraversy

// Construct Single Node
class Node {
  constructor(data, next = null) {
    this.data = data;
    this.next = next;
  }
}

// Create/Get/Remove Nodes From Linked List
class LinkedList {

iscott

Cheat Sheet: Simple Authentication in Rails 6 with has_secure_password

The goal of this cheatsheet is to make it easy to add hand-rolled authentication to any rails app in a series of layers.

First the simplest/core layers, then optional layers depending on which features/functionality you want.

Specs
AUTHOR	Ira Herman
LANGUAGE/STACK	Ruby on Rails Version 4, 5, or 6

jtallant

Setting up Sinatra Project

create an empty project and add a Gemfile

cd ~/Desktop
mkdir project-name
cd project-name
touch Gemfile

tomdalling

#!/user/bin/env ruby

require 'bundler/inline'
gemfile(true) do
  source 'https://rubygems.org'
  gem 'sinatra', '~> 1.4'
  gem 'bcrypt', '~> 3.1'
end

require 'sinatra/base'

vasanthk

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

mdang

Ruby on Rails Cheatsheet

Architecture

Create a new application

Install the Rails gem if you haven't done so before

cmkoller

Setting Up Sinatra Flash

Sinatra Flash is an awesome gem that allows you to pop up little messages alerting your users of important things, via some simple code in your server.rb file. This is very useful for things like displaying error messages if the user has filled out a form wrong, or displaying "success" messages if the user did something successfully like sign in, sign out, or submit a form.

This also gives you a great chance to implement Foundation's beautiful alerts. Here's how to set it up!

1. Install the gem by typing gem install sinatra-flash in your terminal.
2. Require the gem in the top of your server.rb file: require 'sinatra/flash'

victorwhy

HTML and Sinatra really only support the GET and the POST methods. In order to be able to use the PUT and DELETE methods in Sinatra, you kind of have to "trick" the form to go to the right place. Then you can name the routes the proper way - otherwise you can only really work with GET and POST.

I used the Craiglist Jr challenge for some examples. Let's look at a quick example of a POST form/method/route- in this case, we're creating a new Craigslist article:

POST form and corresponding route:

<form action="/article/new" method="post">
  --------------------------------
  YOUR FORM FIELDS HERE

jessieay

ActiveRecord cheat sheet / EXAMPLES

INSTALL 
=======  
$ gem install activerecord
in GEMFILE: gem ‘activerecord’

REQUIRE 
=======  
require ‘active_record’

amejiarosario

Rails ActiveRecord (association) - Cheatsheet

http://guides.rubyonrails.org/association_basics.html

Types of associations

• belongs_to : TABLE_NAME
• has_one : TABLE_NAME [:through => :TABLE_NAME]
• has_many : TABLE_NAME [:through => :TABLE_NAME]
• has_and_belongs_to_many : TABLE_NAME [:join_table => :TABLE_NAME]