gistfile1.rb

movies = {
    "Gatsby" => 4
}
puts "What's a movie you like?"
choice = gets.chomp

case choice
when "add"
    puts "What's the title?"
    title = gets.chomp
    if movies[title]
        puts "What's the rating?"
        rating = gets.chomp
        movies[title] = rating
    end
when "update"
        puts "Updated!"
when "display"
        puts "Movies!"
when "delete"
        puts "Deleted!"
else
    puts "Error!"
end