data.csv

score_reader.rb

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

puts "What is the name of the file which holds the data?"
file_name = gets.chomp

students = []
CSV.foreach(file_name, headers: true) do |row|
	students << Student.new(row["name"],row["grade"])
end

#making hash for each group
nineties = []
eighties = []
seventies = []
less_than_70 = []

students.each do |student|
	name = student.name
	score = student.score.to_i
	if score > 90
		nineties << name
	elsif score > 80
		eighties << name
	elsif score > 70
		seventies << name
	else
		less_than_70 << name
	end
end

puts "90: #{nineties.length}"
puts "80: #{eighties.length}"
puts "70: #{seventies.length}"
puts "<70: #{less_than_70.length}"
puts ""
puts "==== 90+ ===="
puts nineties
puts "==== 80-89 ===="
puts eighties
puts "==== 70-79 ===="
puts seventies
puts "==== <70 ===="
puts less_than_70

student.rb

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

	def name
		@name
	end

	def score
		@score
	end
end