From: andrew@...
Date: 2015-09-19T06:40:44+00:00
Subject: [ruby-core:70863] [Ruby trunk - Feature #11473] Immutable String	literal in Ruby 3

Issue #11473 has been updated by Andrew Vit.


Rodrigo Rosenfeld Rosas wrote:
> Hi Andrew, why mutating a string would change every other place the string is referenced? Wouldn't the string reference remain the same?

~~~
a = "asdf".freeze
b = "asdf".freeze
a.object_id == b.object_id
~~~

Frozen strings for the same value are the same object. If you "unfreeze" one, it would change every other one. Two copies of a string can have the same value for different reasons; it would be very wrong if both changed. On the other hand, if we automatically dup it then it's just like doing this, which won't do what you expect:

~~~
builder = "".freeze
(builder.dup) << "asdf"
builder == "asdf" # false
~~~


----------------------------------------
Feature #11473: Immutable String literal in Ruby 3
https://bugs.ruby-lang.org/issues/11473#change-54245

* Author: Koichi Sasada
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
Matz said "All String literals are immutable (frozen) on Ruby 3".

This ticket is place holder to discuss about that.




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