FifthSurprise

#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?

FifthSurprise

### Keybase proof

I hereby claim:

  * I am FifthSurprise on github.
  * I am fifthsurprise (https://keybase.io/fifthsurprise) on keybase.
  * I have a public key whose fingerprint is 0DCF 4B72 A275 BF92 DB2C  B132 58CB 6FB2 DC0B 1536

To claim this, I am signing this object:

FifthSurprise

# Write your code here!
require 'pry'
def nyc_pigeon_organizer(pigeon_data)
  result = {}
  #going through the list of all the attributes
  pigeon_data.each do |attributetype, attributelist|
    attributelist.each do |attribute, pigeonlist|
      pigeonlist.each do | pigeonname|
        result[pigeonname]={} unless(result[pigeonname]) #add pigeon if not added before
        if(attributetype == :color)

FifthSurprise

~~Ruby Trivia
~~Question:
What is the highest level in the object model?  

~Answer:
`BasicObject`

~~Question:
Is everything in Ruby an object?  

FifthSurprise

*  You can run multiple instances of rails server by changing the port number:  rails s -p 3001
*  For learning CSS stuff - http://flukeout.github.io/
*  Assume the following tables:  A table of users, and a table of books. 
  **  Outer left join is used for in the following scenario:  If you had users who may have books, an outer left join would allow you to get all the users and their books, if they have them.
  **  Inner join would get all of the users even if they have no books and all of the books even if they have no users.
  **  Full outer join would be all of the users and all of the books whether they have an associated book or user.
*  When :js => true when using Caybara and Javascript, you need to make sure the database is truncation instead of transaction since a separate thread is spun off during testing.
*  Ruby Trivia: https://github.com/gregstallings/ruby-trivia

FifthSurprise

function updateSearchValues() {
    function collect(arr, value) {
        var results = [];
        for (var i = 0; i < arr.length; i++) {
            results.push(arr[i][value]);
        }
        return results;
    };
    var booksearch = $("#booksearch");
    //Only request if 3 or more characters entered into search

FifthSurprise

~~Flatiron Students
~~Question:
Guess the student.
![Justin Belmont](http://students.flatironschool.com/img/students/justinbelmont_profile.jpg)
~Answer:

Justin Belmont
~~Question:
Guess the student.
![Morgan Evans](http://students.flatironschool.com/img/students/M.Evans.school.square.jpg)

FifthSurprise

~~Pokemon
~~Question:

Bulbasaur
~Answer:
![Bulbasaur](http://Bulbasaur.jpg.to)

~~Question:

Ivysaur

FifthSurprise

~~Hipster Ipsum
~~Question:
Street art fap roof party Intelligentsia mustache keytar church-key Shoreditch Marfa
~Answer:
 Meggings shabby chic pug, chia Etsy street art Godard High Life direct trade
~~Question:
 Put a bird on it banjo DIY, trust fund viral yr meh ennui Marfa
~Answer:
 Bicycle rights chambray before they sold out High Life Banksy
~~Question:

FifthSurprise

~~Big O
~~Question:
Depth First Search (DFS)
~Answer:
Graph of |V| vertices and |E| edges
Average Time Complexity: - 
Worst Time Complexity: (Good) O(|E| + |V|)
Worst Space Complexity: O(|V|)