JoelLindow/mod1_w2_diagnostic.md

## mod1_w2_diagnostic.md

      
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    Week 2 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 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).

Use single (`) and triple backticks (```) to container code snippets.

1.  Define a class called PizzaOven which has a method cook_pizza which returns the string "mmm 'za".

class PizzaOven
 def cook_pizza
  "/"mmm /'za/""
 end
end
2.  Define a class called Student which is instantiated with a "name" value and which has a method name that returns this value

class Student

 def initialize(name)
 @name = name
 end

 def name
 name
 end
end
3.  Given an array of the numbers [1,2,3,4,5], how would you create a new array of all elements doubled? How would you return an array of all odd elements?

array = [1, 2, 3, 4, 5]

#doubles stored in array
doubled = array.map do |num|
           num * 2
           end          
           
#new array of all odds
odds = array.select do |num|
           num.odd?
           end
4.  Give the command to create a new Git repository in a directory on your machine

git init
Pizza

5.  Given a hypothetical Pizza class which has an instance method is_tasty? that always returns true, write a simple Minitest test that tests this behavior.

class PizzaTest
 def test_if_pizza_is_tasty
  my_pizza = Pizza.new
  assert my_pizza.is_tasty?
 end
end
6.  Suppose the Pizza class also has a method style which randomly returns one of: "supreme", "mediterranean", or "cheese". Write a test that confirms that the returned pizza style is within this list.

def test_pizza_has_style_options
 my_pizza = Pizza.new
 styles = ["supreme", "mediterranian", "cheese"]
 assert_includes styles, my_pizza.style 
end
6.  Give the Git commands needed to stage and then commit a set of changes to a file

git add
git commit -m
Student

7.  Define a Student class which, when created, has an attitude attribute.

attitude should start out with the value "cheerful", and the Student class should provide a "reader" method that allows us to access the value of its attitude.
class Student
 attr_reader :attitude
 
 def initialize
  @attitude = cheerful
 end 
end
8.  Additionally, add an assign_homework method to Student. When assigned_homework is invoked, if the student's attitude is "cheerful", it should become "dubious". If the value is currently "dubious" it should become "perturbed". If the value is currently "perturbed", it should become "dazed". Assigning homework to a "dazed" student has no effect.

This question could not be more on point.
class Student
 attr_reader :attitude
 
 def initialize(attitude = "cheerful")
  @attitude = attitude
 end
 
 def assign_homework
  if @attitude == "perturbed"
   @attitude = "dazed"
  elsif @attitude == "dubious"
   @attitude = "perturbed"
  elsif @attitude == "cheerful"
  end
 end
 
end
9.  Building on the Student class from the previous example, update the assign_homework method to accept an argument. The argument will be a String containing a short description of the assignment. For example we might use it like this:

Don't Understand the question well enough to take action.
s = Student.new
s.assign_homework("Write a linked list")
Then, add an assignments method to Student. assignments should return a list of all the assignments that have been given, separated by a comma and a space. For example:

s = Student.new
s.attitude
=> "cheerful"
s.assign_homework("write a linked list")
s.attitude
=> "dubious"
s.assign_homework("write a BST")
s.attitude
=> "perturbed"
s.assignments
=> "write a linked list, write a BST"
10. Given an array of 3 Student instances, generate a new string of all of their assignments

For example:
s1 = Student.new
s2 = Student.new
s3 = Student.new

s1.assign_homework("linked list")
s1.assign_homework("sorting algos")

s2.assign_homework("write a c compiler")
s2.assign_homework("write a pacman game")

s3.assign_homework("headcount")
s3.assign_homework("sales engine")

=> "linked list, sorting algos, write a c compiler, write a pacman game, headcount, sales engine"
11. What does the following code output?

def print_variables(x)
  puts "x: #{x}"
  puts "b: #{b}"
end

def b
  12
end

a = 4
print_variables(a)


=>  x: 4    #<----- ANSWER
=>  b: 12
12. Working with files: given a text file located at "~/Documents/pizza.txt", write code to read the

file from the filesystem and print each line one at a time.
File.open("~/Documents/pizza.txt", "r").each_line do |line|  #<--- "r" for read file
 puts line
end
13. Writing Files: given a text file located at "~/Documents/pizza.txt", write code to read the file from the filesystem, then write a new file at "~/Documents/line_count.txt" containing the number of lines in the original file.

NO IDEA

14.  Imagine a simple ruby class designed to represent a Corgi dog. Write a test for each of the following features:


A Corgi can be created with no arguments

def test_if_corgi_with_no_arguements
 corgi1 = Corgi.New
 assert_instance_of Corgi
end


A Corgi can be assigned a name

def test_if_corgi_can_have_name
 corgi1 = Corgi.New
 assert_if_equal Corgi.new(name), "Jasper"
 end


A Corgi can be asked for its name

def test_if_corgi_can_have_name
 corgi1 = Corgi.New
 assert corgi1.name
 end


A Corgi can be asked for its posture, which should default to "standing"

class Corgi
attr_reader :posture

 def initialize(posture)
  @posture = "standing"
 end
end

def test_posture
 corgi1 = Corgi.New
 assert_if_equal Corgi.new(posture), "standing"
 end


A Corgi can be asked to lie down, which should change its posture to "laying"

NOT SURE