week_2_day_5_afternoon.rb

class Sandwich
  @slices_of_bread = 2

  def how_much_bread()
    @slices_of_bread
  end
end
  
  #Instance variable you can access anywhere inside the class; 

  $mustard
  #global variable available anywhere in the program; 
  #Something can go badly wrong when global variables override each other; 
  
get '/students/:first_name' do
  #Inside this you can access the params hash params[:first_name]
  erb :students
end

get '/hello'
 #Inside here params is in this state params = {}
end

/students/erik?color=emo
#Before the question mark is the reseource and after the question mark is the query string; 

#If the key in the resource and the key in the query string are the same the ket in the resource will override the key in the query string; 

<form action="/post?hotdog=ladies+pink+hot" method="post">
  <input = "color" name="color">
</form>
# The params inside the form will override the params inside the URL; 

##LINKS.CSV
#Commas separating the columns (make sure you have no spaces between the commas);

#You can push a hash into an array: 
 links = []
 links.push({
   :url => parts[0],
   :text => parts[1]
 })

#Something that is always unique is the current time; 
#We count the number of seconds since the EPOCH Jan 1st 1970; 
#To work out the current date, they work out how many days since the Epoch; 

Time.now.to_i #Everytime you request this the number goes up

f = File.new("receipt=#{ Time.now.to_i}")