[jira] [Commented] (JEXL-307) Variable redeclaration option

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[jira] [Commented] (JEXL-307) Variable redeclaration option

ASF GitHub Bot (Jira)

    [ https://issues.apache.org/jira/browse/JEXL-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987267#comment-16987267 ]

Henri Biestro commented on JEXL-307:
------------------------------------

Changeset: 0d51930407eed691e11dc2767f34ef5df6cbf4b8
Author:    henrib <[hidden email]>
Date:      2019-12-03 22:08
Message:   JEXL-307: fixed lexical feature handling of variable scope in for units (take 3)

> Variable redeclaration option
> -----------------------------
>
>                 Key: JEXL-307
>                 URL: https://issues.apache.org/jira/browse/JEXL-307
>             Project: Commons JEXL
>          Issue Type: New Feature
>    Affects Versions: 3.1
>            Reporter: Dmitri Blinov
>            Assignee: Henri Biestro
>            Priority: Minor
>             Fix For: 3.2
>
>
> As of now, JEXL allows a script writer to redeclare a local variable during script evaluation.
> {code:java}
> var a = 1; var a = 2;{code}
> This may lead to potential errors with misspelled names and clashed variables. Checking for already defined variable is a common feature of many languages. This feature can be implemented in JEXL as an additional option of JexlFeatures class, enabled by default, thus allowing compatibility with existing code.



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