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require 'yaml'

students = YAML::load(File.read(ARGV[0]))
keys = students[0].keys
content = students.map { |student| student.values.join("\t") }.join("\n")

if ARGV[1]
  File.open(ARGV[1], 'w') do |file|
    file.puts keys.join("\t")
    file.puts content
  end
else
  puts keys.join("\t")
  puts content
end

require 'yaml'

in_lines = File.read(ARGV[0]).split("\n")
keys = in_lines[0].split("\t")
students = []
in_lines[1..-1].each do |line|
  data = line.split("\t")
  hash = {}
  data.each.with_index { |d, i| hash[keys[i]] = d }
  students << hash
end

if ARGV[1]
  File.open(ARGV[1], 'w') { |file| file.puts students.to_yaml }
else
  puts students.to_yaml
end

def fizzbuzz(size, &strategy)                                                     
  arr = []                                                                        
  (1..size).each do |i|                                                           
    s = ''                                                                        
    s += 'Fizz' if i % 3 == 0                                                     
    s += 'Buzz' if i % 5 == 0                                                     
    if s.empty? then arr << i else arr << s end                                   
    if strategy                                                                   
      if s.empty? then yield i else yield s end                                   
    end                                                                           
  end                                                                             
  arr                                                                           
end