Diagnostic Week 4

1. Give one difference between Modules and Classes.

  Classes can change their states, Modules cannot. 


2. Defining Modules

  Modules hold methods that can be used across different classes. 
  
  module Doughy
  
    def has_carbs?
      true
    end
  
  end
  
  class Pizza
  
  include Doughy
  
end

Pizza.new.has_carbs?

3. What are two benefits modules provide us in Ruby? Elaborate on each.

    They can DRY up our program by taking out repetative code.
    
    Mix in modules into different classes. 
    
    They're really great for holding messages. Then you don't have to clutter your class with strings. 

4. What values in Ruby evaluate as “falsy”?

  Nil and False

5. Give 3 examples of “truthy” values in Ruby.

  0
  "true"
  true

6. List 3 HTTP Verbs

  GET 
  POST 
  DELETE
  
 7. HTTP Parsing: given the following HTTP Request, identify the following:

  HTTP Verb: POST
  Request Path: 127.0.0.1:9292
  Query Parameters: text/html
  
  URL:127.0.0.1:9292/students?name=horace
  
  
 8. Git and Branches: give a git command to accomplish each of the following:

  Switch to an existing branch iteration-1
  
      git checkout -iteration-1
      
  Create a new branch iteration-2
  
    git checkout -b iteration-2
  
  Push a branch iteration-2 to a remote origin
  
    git push origin iteration-2
  
  Merge a branch iteration-1 into a branch master (assume you are not on master to begin with)

    git checkout master
    git merge iteration-1
    
    
   9. Load Paths and Requires
   
   require "lib/file_one"
   require_relative "file_one"
   
   10. Refactoring: given the following snippet of code, show 2 refactorings you might make to improve the design of this code.

    class Encryptor
      def date_offset
        date = Time.now.strftime("%d%m%y").to_i
        date_squared = date ** 2
        last_four_digits = date_squared.to_s[-4..-1]
        
        last_four_digits.map do |x|
          x.to_i
         end
      end
  end

Encryptor.new.date_offset