gistfile1.txt

# Given a CSV of people, display them grouped together by their favorite colors

require 'csv'

# Gather the data...

results = Array.new.tap do |a|
  CSV.foreach File.expand_path('../people.csv', __FILE__), headers: true do |row|
    a << row.to_hash
  end
end.reject do |person|
  person['Favorite Color'].nil?
end.group_by do |person|
  person['Favorite Color']
end

# Display it in some kind of useful way...

results.each do |color, people|
  puts color
  puts "==============="
  people.each do |person|
    puts "#{person['First Name']} #{person['Last Name']}"
  end
  puts "\n"
end