bayendor

def flatten_clone(array, level = -1, result = [])
  array.each do |element|
    if element.is_a?(Array) && level != 0
      flatten_clone element, level - 1, result
    else
      result << element
    end
  end
  result
end

bayendor

The cryptic Ruby function takes an array as an argument and returns an array of the items that occur more than once in the original array.

It does this using the inject method specifying an empty Hash as the accumulator. It iterates over each item in the array by referencing the item index position, and passes the resulting item into the accumulator. This builds up a hash of key/value pairs with the key being the item from the initial collection and the value representing the number of times the item appears in the array. It then uses the reject method on the resulting hash and iterates over the hash returning a new array containing the items in self for which the given block is false.

Using idiomatic Ruby a cleaner way to write this function would be:

def show_duplicates(collection)
  collection.select { |element| collection.count(element) > 1 }.uniq
end

bayendor

# Find all the items that have the word "elegant" in it.
items = Item.where("name LIKE ?", "%elegant%")

# Add three orders to a user.
  3.times do |i|
  user = User.first
  order = Order.create!(user_id: user.id)
  order.items << Item.find(i + 1)
  end
  

bayendor

namespace :deploy do
  desc "Deploys app to Github & production."
  task all: :environment do
    if system("rake test:all") == false
      puts "The tests fail."
      break
    end

    puts "The tests passed."

bayendor

require 'rspec'

def sum(numbers)
  numbers.inject(0) { |sum, number| sum + number }
end

def product(numbers)
  numbers.inject(1) { |sum, number| sum * number }
end

bayendor

class Counter
  def self.counter(session)
    session[:hit_counter] ||= 0
    session[:hit_counter] += 1
  end
end

# access with
class ItemsController < ApplicationController
  before_action :load_counter

bayendor

1. What's the difference between a cookie and a session? A session lasts until the browser is closed, a cookie is persistent state stored in a small text file.
2. What's serialization and how does it come into play with cookies? The cookies stores serialized data about the session.
3. Can a cookie be shared by more than one user? How/why? Probably.
4. What would it mean to store a shopping cart in a cookie? The shopping cart would persist from session to session.
5. What advantages/disadvantages are there between cookie-stored carts and database-stored carts?

bayendor

describe "the idea creation process", :type => :feature do
  it "goes to the home page" do
    visit '/'
    within("#session") do
      fill_in 'Title', :with => 'great idea'
      fill_in 'Description', :with => 'so awesome all the things'
    end
    click_button 'submit'
    expect(page).to have_content 'Great Idea'
  end

bayendor

#What are database tables, column, and rows? What's the purpose of each?

Table is a collection of columns and rows

Column is a particular datatype, named with lowercase_separated_with_underscores

Row is a collection of data elements in a table each represented by a column, synonym for record

#How's a database similar and different from a spreadsheet?

bayendor

class Cleaner
  def domain_from_email(email)
    email.match(/([\w+\-.]+)@([a-z\d\-.]+\.[a-z]{2,4}+)/)[2]
  end

  def area_code_only(phone_number)
    phone_number.match(/(\+*\d{1,})*([ |\(])*(\d{3})[^\d]*(\d{3})[^\d]*(\d{4})/)[3]
  end

  def get_secret_message(string)