Module 1 Week 4 Diagnostic

Module 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.
```
Modules can be initializd.
Modules have mixins.
```

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
end

class Pizza
include Doughy
  def tasty?
    true
  end
end

Pizza.new.has_carbs?
```

3. What are two benefits modules provide us in Ruby? Elaborate on each.
```
module has namespacing and mixins
1.When a module is used as a container for objects, it’s called a namespace
2.Mixins allow you to share functionality between classes. if a class mixes in a module, that module's instance methods become available as if they had been defined in the class. 
```

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

5. Give 3 examples of “truthy” values in Ruby.
```
true
"hello"
0
```

6. List 3 HTTP Verbs
```
GET
POST
PUT
```

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

HTTP Verb 
Request Path
Query Parameters

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 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 branchname

Merge a branch iteration-1 into a branch master (assume you are not on master to begin with)
git merge iteration-1 master

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.split("").map { |s| s.to_i }
   
  end
end

Encryptor.new.date_offset
```