"Scoped Mutable Variables"

[Alaa Mohamed]

Thank you for your feedback.

On Thu, 22 May 2025, 6:57 pm Chen Liang, <chen.l.liang at oracle.com> wrote:

> Hello, I don't think this proposal "reduce unintended side effects caused
> by variable mutations in nested blocks". This massively decreases the
> readability of code. Your purposed problem can be solved by declaring new
> non-final local variables in the nested scopes and making the main local
> variable final, and there is no proof that your proposed problem actually
> happens in development. You can search for Static Single-Assignment form
> for more efficient usages of variables that is both more human and machine
> friendly. Also on a side note, Java Language feature discussions usually
> happen on compiler-dev list.
>
> Regards, Chen Liang
> ------------------------------
> *From:* jdk-dev <jdk-dev-retn at openjdk.org> on behalf of Alaa Mohamed <
> 333alaamo at gmail.com>
> *Sent:* Wednesday, May 21, 2025 8:54 PM
> *To:* jdk-dev at openjdk.java.net <jdk-dev at openjdk.java.net>
> *Subject:* "Scoped Mutable Variables"
>
>
> Dear OpenJDK Reviewers and Community,
>
> I hope this message finds you well.
>
> Please find attached my draft Java Enhancement Proposal (JEP) titled
> "Scoped Mutable Variables" (JEP XXXX), which introduces a new variable
> declaration modifier scoped. This modifier allows variables to be mutable
> exclusively within a limited lexical scope (such as inside if, for, or
> while blocks) without affecting the variable’s value in the enclosing or
> global scope.
>
> This proposal aims to reduce unintended side effects caused by variable
> mutations in nested blocks, thereby improving code safety and readability
> in large-scale Java projects.
>
> I would appreciate any feedback or suggestions you may have on the design,
> naming, integration approach, or any other aspect of the proposal.
>
> Please find the full proposal text attached (or below).
>
> Thank you very much for your time and consideration.
>
> Best regards,
> Alaa Mohamed
> [Your email]
> [ GitHub - alaa-333/scoped-variable-jep
> <https://github.com/alaa-333/scoped-variable-jep.git> ]
>
> [ LinkedIn :
> https://www.linkedin.com/in/alaa-mohamed-1468a3304?lipi=urn%3Ali%3Apage%3Ad_flagship3_profile_view_base_contact_details%3BOH8SwytOQoO2HCH0VxvdBA%3D%3D
> ]
> Also for more details : Java Enhancement Proposal (JEP) (1).pdf
> <https://drive.google.com/file/d/1P-k9XfpRzLdnuOYUpBUFfPaHBGWHjM9z/view?usp=sharing>
>
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