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class LiveCell
  TRANSITION_RULES = {
    2 => LiveCell.new,
    3 => LiveCell.new,
  }

  def next_generation(living_neighbours_count)
    TRANSITION_RULES.fetch(living_neighbours_count) { DeadCell.new }
  end
end

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# 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

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# config/staging.rb
Rails.application.configure do
  config.middleware.use "::Rack::Auth::Basic" do |u, p|
    [u, p] == [ENV["BASIC_AUTH_USERNAME"], ENV["BASIC_AUTH_PASSWORD"]]
  end
end

# .env
BASIC_AUTH_USERNAME = some_value
BASIC_AUTH_PASSWORD = some_password

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Modules

To understand modules, we first have to understand a little bit about how Ruby works. So, lets define the things that exist in Ruby and see how they work together. Then, we will be able to understand how modules fit into this, and what they are here for.

Definitions

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#Vim Cheat Sheet

• gqip - Reformats paragraph to textwidth
• gq - Reformats selection
• :Tab /= - Equally spaces based on the = symbol (requires Tabular vim plugin)
• :setf language - Changes current language
• :set language=language - Changes current language
• <C-a> - Increments the number under the cursor
• <C-x> - Decrements the number under the cursor
• ~ - Toggles case and moves to next character in normal mode

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NYC Recommendations

Friends' lists:

• Tyson Gach: https://foursquare.com/user/11467850
• Phil Oye: https://gist.github.com/philoye/240cf8c2d3636f74ed51

Smorgasburg: foodie market in various locations between April to November. Go hungry!

Williamsburg and Bushwick:

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Coding Problems

Evaluation criteria

• Code demonstrates knowledge of Ruby syntax, style, organisation, and refactoring
• Code is divided into logical components and methods with clear responsibility.
• Code meets all requirements as laid out per the specification.

In one sentence: we are looking for simplicity, readability, and good practices

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# POODR page 28
Wheel = Struct.new(:rim, :tire)
def wheelify(data)
  data.collect {|cell| Wheel.new(cell[0], cell[1])}
end

# POODR Page 32
class Gear
  attr_reader :chainring, :cog, :wheel
  def initialize(chainring, cog, rim, tire)

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Rules for Horizontal Refactoring

• If you go red, undo
• Only change one line at a time

1. Find two strings that are the most alike
2. Find the smallest difference
3. Make the smallest change that make the tests pass

How to make a small change

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require "json"
require "net/http"

class DataRetriever
  include ActiveModel::Model
  attr_reader :search_param, :search_by_id

  def get_data(search_param, options = {})
    @search_by_id = options.fetch([:search_by_id], false)
    @search_info = search_info