joofsh

Nation JS notes

Rise of Web Workers:

• frameworks causing increase in time browser spends "scripting" (running JS) to handle simple button clicks
• web workers are a separate thread that can handle non-DOM tasks. Only limitation is that it cannot touch DOM
• Example: Run all of react in web worker, only run React.render() in main thread
• Two demo apps with many DOM updates, 1 using web workers has better FPS
• JSON.stringify() fastest way to send data between main thread and web worker
• Challenge: Running e.preventDefault(). The e object does not exist in the web worker

joofsh

require 'httparty'

id = nil
while true
  url = "http://www.letsrevolutionizetesting.com/challenge.json"
  url += "?id=#{id}" if id
  resp = HTTParty.get(url)
  puts resp
  id = resp['follow'].split('id=').last
end

joofsh

DEBUG (00:56:31): Hook :run_all_end executed for Guard::RSpec                                                         
DEBUG (00:56:31): Hook :run_all_begin executed for Guard::Spork                                                       
DEBUG (00:56:31): Start interactor                                                                                    
DEBUG (00:56:53): Stop interactor                                                                                     
DEBUG (00:56:53): Start interactor                                                                                    
DEBUG (00:57:09): Stop interactor                                                                                     
DEBUG (00:57:09): Trying to run Guard::RSpec#run_on_modifications with ["spec/views/queries/new.html.haml_spec.rb", "s
pec/requests/queries_spec.rb"]                                                                                        
DEBUG (00:57:09): Hook :run_on_changes_begin executed for Guard::RSpec  

joofsh

cat: /home/jon/.zsh/env/gem-path-prepends: No such file or directory
cat: /home/jon/.zsh/env/rbenv-path-prepend: No such file or directory
cat: /home/jon/.zsh/env/rvm-path-prepend: No such file or directory
cat: /home/jon/.zsh/env/gem-path-prepends: No such file or directory
cat: /home/jon/.zsh/env/rbenv-path-prepend: No such file or directory
cat: /home/jon/.zsh/env/rvm-path-prepend: No such file or directory
cat: /home/jon/.sh/gem-path-prepends: No such file or directory
cat: /home/jon/.sh/,rbenvi: No such file or directory
cat: /home/jon/.sh/rbenv-init: No such file or directory
cat: /home/jon/.sh/rbenv-path-prepend: No such file or directory

joofsh

  class FromWithQuery < Treetop::Runtime::SyntaxNode
    def content
      arr = [ self.elements[0].text_value.strip,
      self.elements[1].text_value.split(",").map do |v|
        v.strip
      end ]
    end
  end
  

joofsh

require 'spec_helper'
describe QueryParser do
  it "doesn't implode from simple SQL queries" do
    foo = []
    foo.push QueryParser.parse "SELECT user.name == 'bob' FROM users".downcase
    foo.push QueryParser.parse "SELECT * FROM users WHERE user.name == 'bob'".downcase
    foo.push QueryParser.parse 'select * from foo order by DESC'.downcase
    foo.push QueryParser.parse "select name,email FROM users".downcase
    foo.push QueryParser.parse "select * FROM joo".downcase
    foo.push QueryParser.parse "select * FROM name == 'foo'".downcase

joofsh

Problem:  In the matrix (below) 4 diagonal consecutive numbers are 26  63  78  14 and their product equals 1788696.

What is the greatest product of four adjacent numbers in any direction (up, down, left, right, or diagonally) in the 20x20 grid?

###Problem 11
MATRIX = [
%w(08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08),
%w(49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00),
%w(81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65),
%w(52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91),

joofsh

class Product < ActiveRecord::Base
  attr_accessible :category, :name, :price, :generic_product
  attr_accessor :generic_product
  validates_presence_of :name, if: :generic_product?
  validates_presence_of :price, :category, unless: :generic_product?
private
  def generic_product?
    if generic_product == "1"
      true
    else

joofsh

require 'mathn'

class Chain
  attr_accessor :last, :sum, :length
  def initialize
    @last = @sum = @length = 0
  end

  def clean?
    0 == @sum % @last

joofsh

require 'mathn'
class Chain
  attr_accessor :last, :sum, :length
  def initialize
    @last = 0
    @sum = 0
    @length = 0
  end
  def clean?
    0 == @sum % @last