week_4_diagnostic_1703-BE

week_4_diagnostic_1703-BE.md

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.

• Answer 1: Modules are not instantiated, while classes can be.

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.

• Answer: Absolutely no idea how to do this. Don't even know where to start.

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

  def has_carbs?
    true
  end

  class ChicagoStyle < Pizza
    def pan?
      true
    end

    def tasty?
      false
    end
  end
end

pizza = Doughy::ChicagoStyle.new
puts pizza.pan?
puts pizza.tasty?

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

• Answer_1: The can clean up our classes
• Answer_2: Modules allow "mix-ins"

4. What values in Ruby evaluate as "falsy"?

• Answer_1: nil
• Answer_2: False

5. Give 3 examples of "truthy" values in Ruby.

• Answer_1: "Banana"
• Answer_2: []
• Answer_3: {}

6. 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

7. 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_relative 'file_1'
• require './lib/file_1'

8. 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)
  end
  
  def last_four_digits(date_squared)
  date = date_squared.to_s[-4..-1].chars
  date.map! { |num|
    num.to_i
    }
  end


end

Encryptor.new.date_offset