nokogiri_scraping_questions.rb

#1) What is your favorite Ruby class/library or method and why?
I like Ruby in all. Some awesome points: Blocks/Lambdas, "Everything is an Object", Metaprogramming, etc.
---------------

#2) Given HTML: "<div class="images"><img src="/pic.jpg"></div>" Using Nokogiri how would you select the src attribute from the image? Show me two different ways to do that correctly the the HTML given.
document = Nokogiri::HTML(open("http://lalala.com/"))
document.at_css('.images img').attr('src')
#or
document.xpath('//div[@class="images"]/img/@src').map {|s| s.value }
---------------

#  3) If found HTML was a collection of li tags within a div with class="attr", how would you use Nokogiri to collect that information into one array?
document.xpath('//li[@class="attr"]').map {|li| li.value }
---------------

# 4) Given the following HTML: <div class="listing"> <div class="row"> <span class="left">Title:</span>
# <span class="right">The Well-Grounded Rubyist</span> </div> <div class="row"> <span class="left">Author:</span>
# <span class="right">David A. Black</span> </div> <div class="row"> <span class="left">Price:</span>
# <span class="right">$34.99</span> </div> <div class="row"> <span class="left">Description:</span>
# <span class="right">A great book for Rubyists</span> </div> <div class="row"> <span class="left">Seller:</span>
# <span class="right">Ruby Scholar</span> </div> </div>
# Please collect all of the data presented into a key-value store. Please include code and the output.

document = Nokogiri::HTML('<div class="listing"> <div class="row"> <span class="left">Title:</span>
 <span class="right">The Well-Grounded Rubyist</span> </div> <div class="row">
 <span class="left">Author:</span> <span class="right">David A. Black</span> </div>
 <div class="row"> <span class="left">Price:</span> <span class="right">$34.99</span>
 </div> <div class="row"> <span class="left">Description:</span> <span class="right">A great book for Rubyists</span>
 </div> <div class="row"> <span class="left">Seller:</span> <span class="right">Ruby Scholar</span> </div> </div>')

books = document.xpath('//div[@class="row"]/span').map do |v|
  res = v.xpath('//span').map(&:text)
  evens = res.values_at(*a.each_index.select(&:even?))
  Hash[*(evens).zip(res - evens).flatten]
end

p books
=> [{"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"},
    {"Title:"=>"The Well-Grounded Rubyist", "Author:"=>"David A. Black", "Price:"=>"$34.99", "Description:"=>"A great book for Rubyists", "Seller:"=>"Ruby Scholar"}]
------------------

#5) What Ruby feature do you hate?
It is sometimes slow...