To improve

movies.rb

movies = { gone_with_the_wind: 3, the_lion_king: 4, the_matrix: 4 }

puts "What would you like to do?"
puts "--Type 'add' to add a movie."
puts "--Type 'update' to update a movie."
puts "--Type 'display' to display a move."
puts "--Type 'delete' to delete a movie."

choice = gets.chomp.downcase
case choice
when "add"
  puts "What movie do you want to add?"
  title = gets.chomp
  if movies[title.to_sym].nil?
    puts "What's the rating? (Type a number 0 to 4.)"
    rating = gets.chomp
    movies[title.to_sym] = rating.to_i
    puts "#{title} has been added with a rating of #{rating}."
  else
    puts "That movie already exists! Its rating is #{movies[title.to_sym]}."
  end
  
when "update"
  puts "What movie would you like to update?"
  title = gets.chomp
  if movies[title.to_sym].nil?
    puts "Movie not found!"
  else
    puts "What rating would you like to give #{title}?"
    rating = gets.chomp
    movies[title.to_sym] = rating.to_i
    puts "#{title} has been updated with new rating of #{rating}."
  end

when "display"
  movies.each do |i,e|
   puts "#{i}: #{e}"
  end
when "delete"
  puts "What movie would you like to delete?"
  tile = gets.chomp
  if movies[title.to_sym].nil?
    puts "That movie does not exist!"
  else
    movies.delete(title)
  end
  
else
  puts "Error!"
end