Support Merge Collection/Map using + Operator

jakartaee / expression-language

Jakarta Expression Language

https://eclipse.org/ee4j/el

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Support Merge Collection/Map using + Operator #247

Open hantsy opened 1 month ago

hantsy commented 1 month ago

To simplify the operators of concatenating Collections/Maps.

aList + aSet returns a new list
aMap+ anotherMap returns a new Map.

markt-asf commented 1 month ago

This needs to be more precisely defined. I'd lean towards referencing an existing method (addAll(Collection) / putAll(Map)) rather than trying to define our own merge function. Cleaner to write the spec, easier for users to understand and easy to implement.

markt-asf commented 3 weeks ago

I have an implementation of this in the current Tomcat 12 development branch. You can download SNAPSHOT build a standard distribution from: https://repository.apache.org/content/groups/snapshots/org/apache/tomcat/tomcat/12.0.0-M1-SNAPSHOT/

Embedded and individual JARs are also available.

If you could try that and and confirm whether or not it works for you that would be great. I can then work on the changes required to the specification document and some TCK tests.