hashing example added

Author: code-lucidal58

README.md

@@ -131,6 +131,18 @@ print 'Good work!!' unless jobNotDone
 Complex expressions can be created using these operators: E.g. *(x && (y || w)) && z*</br>
 Expressions in parentheses are always evaluated before anything outside parentheses.
 
+__case__ is an alternative to _if_ _else_ statements.
+```ruby
+case language
+  when "JS"
+    puts "Websites!"
+  when "Ruby"
+    puts "Web apps!"
+  else
+    puts "I don't know!"
+end
+```
+
 ## Loops and Iterators
 Use of while:
 ```ruby
@@ -361,4 +373,4 @@ my_hash.each_key { |k| print k, " " }
 
 my_hash.each_value { |v| print v, " " }
 # ==> 1 2 3
-```
+```

movie_ratings_update.rb

@@ -0,0 +1,52 @@
+movies = {
+  Memento: 3,
+  Primer: 4,
+  Ishtar: 1
+}
+
+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 all movies."
+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 do you want to update?"
+  title = gets.chomp
+  if movies[title.to_sym].nil?
+    puts "Movie not found!"
+  else
+    puts "What's the new rating? (Type a number 0 to 4.)"
+    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 |movie, rating|
+    puts "#{movie}: #{rating}"
+  end
+when 'delete'
+  puts "What movie do you want to delete?"
+  title = gets.chomp
+  if movies[title.to_sym].nil?
+    puts "Movie not found!"
+  else
+    movies.delete(title.to_sym)
+    puts "#{title} has been removed."
+  end
+else
+  puts "Sorry, I didn't understand you."
+end