freezing strings

freezing.rb

RUBY_DESCRIPTION  # => "ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin13.0]"

"one".freeze.object_id # => 70098950078640

one = "one"
two = "one"

one.object_id # => 70098950065800
two.object_id # => 70098950065780

one.freeze
two.freeze

one.object_id # => 70098950065800
two.object_id # => 70098950065780

"one".freeze.object_id # => 70098950078640
"one".freeze.object_id # => 70098950078640



hash = {}

hash["one"] = "something"
hash.keys.first.object_id # => 70098950062960

hash.delete "one"

hash["one"] = "something"
hash.keys.first.object_id # => 70098950062360