Mod 1 week 4 diagnostic

Mod 1 week 4 diagnostic

# Module 1 Week 4 Diagnostic

This exercise is intended to help you assess your progress with the concepts and techniques we've covered during the week.

For these questions, write a short description or snippet of code that meets the requirement. In cases where the question mentions a "given" data value, use the variable given to refer to it (instead of re-writing the information).

##### 1. Give one difference between Modules and Classes.
 - One difference between modules and classes is that modules are not instantiated. 

##### 2.  Defining Modules

First, create a module `Doughy` which defines a method `has_carbs?` that always returns true. Then, given the following Pizza class, update Pizza to use your new Doughy module to gain the defined `has_carbs?` behavior.

```
module Doughy
  def has_carbs?
    true
  end
    
class Pizza
include Doughy 
  def tasty?
    true
  end
end
```

##### 3. What are two benefits modules provide us in Ruby? Elaborate on each.
 - They allow us to write "drier" code - meaning you can use a module to perform tasks that you may be repeating in a class
 - They allow for mixins. You can have one module that is used across multiple classes - allows ruby, which is an object oriented language to have some of the traits of funtional programming. 

##### 4. What values in Ruby evaluate as "falsy"?
 - nil and false 

##### 5. Give 3 examples of "truthy" values in Ruby.
 - true, 1.0 and "false" 

##### 6.  List 3 HTTP Verbs
 - GET, POST, (don't know a third) 

##### 7.  HTTP Parsing: given the following HTTP Request, identify the following:

*   HTTP Verb - POST 
*   Request Path - /students?name=horace
*   Query Parameters - name=horace 

```
POST /students?name=horace HTTP/1.1
Host: 127.0.0.1:9292
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8
```

What is the full request URL?
 - http://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 branch iteration-1
*   Create a new branch iteration-2: git checkout branch iteration-2 
*   Push a branch iteration-2 to a remote origin: git push branch iteration-2 (I'm not sure on this one)
*   Merge a branch iteration-1 into a branch master (assume you are not on master to begin with): git merge (again, not sure) 


##### 9.  Load Paths and Requires

Given a project with the following directory structure, give 2 ways that we could require file_one from file_two.

```
. <you are here>
├── lib
│  │── file_one.rb
│  └── file_two.rb
```
 - 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[-4].to_i,
    last_four_digits[-3].to_i,
    last_four_digits[-2].to_i,
    last_four_digits[-1].to_i]
  end
end

Encryptor.new.date_offset

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.each_char do |digit|
      digit.to_i
     end
  end
end

class Encryptor
  def date_offset
    date = (Time.now.strftime("%d%m%y").to_i) ** 2
    new_date = []
    new date << date.to_s[-4..-1].to_i
end

```