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https://issues.apache.org/jira/browse/JEXL-440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17993115#comment-17993115
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Xu Pengcheng commented on JEXL-440:
-----------------------------------
+1 for this feature, thanks!
> Switch statement & expressions
> ------------------------------
>
> Key: JEXL-440
> URL: https://issues.apache.org/jira/browse/JEXL-440
> Project: Commons JEXL
> Issue Type: New Feature
> Affects Versions: 3.5.0
> Reporter: Henri Biestro
> Assignee: Henri Biestro
> Priority: Major
> Fix For: Later
>
>
> *Switch / case / default Java-like behavior; statement and expression*
> Switch as a +statement+ rule:
> * case values must be constant (null and NaN are allowed though)
> * return is allowed
> * no default clause is never an issue.
> Switch as +expression+ rules:
> * case values must be constant (null and NaN are allowed though)
> * return is not allowed
> * No strong typing means JEXL can not verify completeness of case matching at
> parsing time; a lack of default clause triggers a runtime exception if no
> case matched.
> The differences between statement & expressions in a nutshell:
> Statement:
> {code:java}
> switch (s) {
> case 1: {
> // some code
> break;
> }
> case 2:
> // more code, follow through to 3
> case 3:
> return 5; // return is allowed
> }
> {code}
> Expression:
> {code:java}
> let v = switch (s) {
> case 1 -> 10;
> case 2, 3 -> 20;
> case 4 -> { 30 + 10 } // jexl is functional, last eval is expression value,
> no yield needed
> default -> null // if not present and no case match, error
> }
> {code}
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