a small ruby puzzle solution

ruby_puzzle_1.rb

# check first non-repeating element from array
  arr = [1,200,1,200,3,4,5]
  res = Array.new
  arr.detect{|e| res << e unless(arr.count(e) > 1) }
  puts "First non-repeated element in Array"+arr.to_s+" is : "+ res.first.to_s


# check even times repeating elements in array
  a =  [5, 3, 5, 1, 5, 1, 3]
  res_arr = Array.new
  a.select{|e| res_arr << e if a.count(e).even? }
  res_arr.uniq!
  p "even times repeating elements in Array"+a.to_s+" are: "+res_arr.to_s