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https://issues.apache.org/jira/browse/FREEMARKER-21?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863848#comment-15863848
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Daniel Dekany commented on FREEMARKER-21:
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Well, after several years of FM2 maintenance I know pretty much all the
unspeakable horrors of FM2 :), but that it throws an exception there
({{InvalidReferenceException}}, "The following has evaluated to null or
missing: foo") is not among them. It's quite common solution actually.
{{(...)\!exp}} is basically an {{InvalidReferenceException}} exception handler
facility, and that's something I do want to change in FM3 though... but that's
another topic.
FM3 related stuff should be discussed on the dev list.
> Reference to the object in condition - avoid repeating the same in #if and
> ${...}
> ---------------------------------------------------------------------------------
>
> Key: FREEMARKER-21
> URL: https://issues.apache.org/jira/browse/FREEMARKER-21
> Project: Apache Freemarker
> Issue Type: New Feature
> Components: engine
> Reporter: Ondra Žižka
>
> Repeating stuff is annoying, especially in programming.
> Therefore this is annoying:
> {code}
> <#if someVariable.someMethod.someProperty??>
> <div>${someVariable.someMethod.someProperty}</div>
> </#if>
> {code}
> This would be better:
> {code}
> <#if someVariable.someMethod.someProperty?? as value>
> <div>${value}</div>
> </#if>
> {code}
> Not talking about the fact that it could only be evaluated once.
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