Object Oriented Programming Challenge

assignment_grade.rb

class AssignmentGrade
	def initialize (score)
		@score = score.to_i
	end

	def score
		@score
	end

	def all
		all_scores = []
		ObjectSpace.each_object(AssignmentGrade) do |score|
			all_scores << score
		end
		all_scores
	end

	def average
		sum = 0
		all.each { |score| sum += score }
		sum / all.length
	end

end

grade_reader.rb

require 'csv'
require 'pry'
require_relative 'assignment_grade.rb'
require_relative 'student.rb'

#GradeReader - an object that is responsible for reading in grade data from a CSV

class GradeReader
	def initialize(file_path)
		raise "#{file_path} does not exist" unless File.exists? file_path
		@file_path = file_path
	end

	def construct_students
		students = []
		CSV.foreach(@file_path, :headers => true) do |row|
			scores = []
			row["scores"].split.each do |score|
				score = AssignmentGrade.new(score)
				scores << score
			end
			student = Student.new(row["student_name"],scores)
			students << student
		end
		students
	end
end

main.rb

require_relative "grade_reader.rb"
require_relative "final_grade.rb"
require_relative "assignment_grade.rb"
require 'pry'

def prompt(query)
	puts query
	gets.chomp
end

filename = prompt "Where are your grades located (insert file name)?"
data = GradeReader.new(filename)
students = data.construct_students

name = prompt "Whose average would you like to check?"
unless name == "n"
	student = students.find do |student|
		student.name == name
	end
	puts student.display_status
end

log_response = prompt "Would you like to log the class grades to a file?"
if log_response == "Yes" || log_response.upcase == "Y"
	students.each do |s| 
	  CSV.open("final_grades.csv", 'a') do |row|
	    row << [s.display_status] 
	  end
  end
end

view_analytics = prompt "Would you like to see the class analytics?"

all_scores = []
ObjectSpace.each_object(AssignmentGrade) do |grade|
	all_scores << grade.score
end

sum = 0
all_scores.each { |score| sum += score }
average = sum / all_scores.length

min = all_scores.minmax.first
max = all_scores.minmax.last

deviations = []
all_scores.each do |score|
	deviation = score-average
	deviations << deviation
end

sum = 0

deviations.each do |d|
	sum += d**2
end

variance = sum / deviations.length
standard_deviation = Math.sqrt(variance)

puts "The class average is #{average}"
puts "The class minimum is #{min}"
puts "The class maximum is #{max}"
puts "The class standard deviation is #{standard_deviation}"

sample_grades.csv

student.rb

class Student
	def initialize(name,grades)
		@name = name
		@grades = grades
	end

	def name
		@name
	end

	def grades
		@grades
	end

	def average
		sum = 0
		grades.each { |grade| sum += grade.score }
		sum / grades.length
	end

	def final_grade
		if average >= 90
			grade = 'A'
		elsif average >= 80
			grade = 'B'
		elsif average >= 70
			grade = 'C'
		elsif average >= 60
			grade = 'D'
		else
			grade = 'E'
		end
	end

	def display_status
		"#{name} has a #{final_grade} with an average of #{average}"
	end

end

Try to make sure that everything is indented consistently, with 2 spaces. Make sure that you've got these settings in your Sublime Text settings https://gist.github.com/HeroicEric/77c860d2fe8d7ae0a98f