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https://issues.apache.org/jira/browse/GROOVY-5291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King updated GROOVY-5291:
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Fix Version/s: (was: 3.0.0-alpha-1)
> Add "a ?:= 2" support: should be expanded to "a = a ?: 2"
> ---------------------------------------------------------
>
> Key: GROOVY-5291
> URL: https://issues.apache.org/jira/browse/GROOVY-5291
> Project: Groovy
> Issue Type: Improvement
> Components: syntax
> Reporter: Rodrigo Rosenfeld Rosas
> Assignee: Daniel Sun
>
> This would allow the very common useful idiom found in Ruby:
> {noformat}
> variable ||= value
> {noformat}
> Currently we have to write code like this in Groovy:
> {noformat}
> def myMap = [:]
> if (condition) (myMap[someLongNameObject.getKeyId()] =
> myMap[someLongNameObject.getKeyId()] ?: []) << someNewValue
> {noformat}
> Also, if getKeyId() is costly or shouldn't get called more than once for some
> reason, we would have to write it like:
> {noformat}
> def myMap = [:]
> if (condition) {
> def key = someLongNameObject.getKeyId()
> (myMap[key] = myMap[key] ?: []) << someNewValue
> }
> {noformat}
> When it could be simplified as this:
> {noformat}
> if (condition) (myMap[someLongNameObject.getKeyId()] ?:= []) << someNewValue
> {noformat}
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