week_2_day_1_morning.rb

TERNARY OPERATOR

n.abs == 1 ? 'bottle' : 'bottles'

#This is saying if the number of bottles is 1 return bottle, if not return bottles;

# In Ruby we have open classes; 
#You can take any class at any point and add extra data into it; 
#MONKEY MATCHING adding something later to something that exists already; 

def self.song(num_bottles=99)
end

#You can provide a default number of bottles of beer; 
#If you call the method with an argument then it will use this, otherwise it will use the default value; 

## DNS, IP, HTTP 
# Type in a URL and DNS turns the URL into a IP address in dotted quad notation (each of the numbers in the range 0-255);
# After getting IP back from DNS sends a HTTP request to the server; 
# The http request has the clients IP address and also the servers IP address; 
# Get the static files, dynamic data from the database and combines into HTML to send back to the client; 
# IPV6, next IP generation - instead of going to 0-255 we will go from 0-356 (we will have an IP address for every atom in the universe!);

##IFCONFIG
# Type ifconfig into terminal;
# inet = internet address; 
# python -m SimpleHTTPServer (what ever folder you are in it will serve these as http);
# Type 10.22.20.117:8000 (the port number is 8000);

##RESOURCES

##SINATRA
# DSL to describe any easy way that web servers should work; 
# Sinara is a web server; 
# You need to require 'sinatra' at the top of your file; 
# Sinatra is on port 4567; 

# Ports, different services can be provided from different ports; 
# Port 80 is webstuff, port 23 is email, port 22 type commands on machine; 

# require 'sinatra/reloader' you do not have to keep re-running the file, it checks for changes; 
# localhost: 4567 (telling the computer which machine and which port);
# WEbrick and Thin are modules that do the heavy lifting stuff between the browser and server; 

##PLACEHOLDER (passing dynamic data into a URL)
get '/name/:first' do 
  "hello #{params[:first]} "
end
# The placeholder is denoted by a colon in front; 
# :first is the key which is accessible in the params hash; 

# mkdir public (static files)
# mkdir views (have erb in here, this is html with embedded Ruby);
# erb stands for embedded (it is html embedded with ruby); 
# <%= %> -> This is not part of html, allows you to embedd ruby code into the code; 

# <% %> syntax (without the = sign) means run the ruby code, but dont show it on the screen;