Ruby 1.9 Hash syntaxes

hash.rb

# Ruby 1.8 Hash syntax:
some_hash = { :person => 'John Doe', :age => 30 } # Hash-Rocket-style

# Ruby 1.9 Hash syntaxes:
some_hash = { :person => 'John Doe', :age => 30 } # Hash-Rocket-style syntax still there.
some_hash = { person: 'John Doe', age: 30 }       # JSON-style syntax, keys are symbols behind the scenes.

# Watch out!
some_hash = { 'person' => 'John Doe', 'age' => 30 } # This will work.
some_hash = { 'person': 'John Doe', 'age': 30 }     # This will not work!