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Date: Mon, 13 Feb 2017 09:32:41 +0000 (UTC)
From: "Daniel Dekany (JIRA)" <jira@apache.org>
To: notifications@freemarker.incubator.apache.org
Message-ID: <JIRA.12960098.1461093462000.61435.1486978361694@Atlassian.JIRA>
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Subject: [jira] [Commented] (FREEMARKER-21) Reference to the object in
 condition - avoid repeating the same in #if and ${...}
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archived-at: Mon, 13 Feb 2017 12:22:32 -0000


    [ https://issues.apache.org/jira/browse/FREEMARKER-21?page=3Dcom.atlass=
ian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D1=
5863386#comment-15863386 ]=20

Daniel Dekany commented on FREEMARKER-21:
-----------------------------------------

In {{(foo as bar)!"Hello!"}} the assignment to {{bar}} simply wouldn't happ=
en, since evaluating {{foo}} basically causes an exception which is then ha=
ndled by the {{(...)!exp}}. Confusing, I know, but the intended use is the =
opposite, that is, we use the `as`-ed (or, well, `into`-ed) variable when i=
ts left side has existed.

As of handling missing values in FreeMarker, the problems of it (particular=
ly when it comes to assigning things) are known, but I don't think we can d=
o much about it in FreeMarker 2. It was made like this 14 years ago or so, =
and you simply can't break backward compatibility that much in 2.x, because=
 that means that tons of projects can't update FreeMarker anymore. That's w=
hy FreeMarker 3 was started not long ago, and there the point is to move in=
to another package (so it doesn't interfere with FreeMarker 2) and break ba=
ckward compatibility and do what's right. But if 3 ever comes out one day, =
FreeMarker 2 will remain with us for a long time...

> Reference to the object in condition - avoid repeating the same in #if an=
d ${...}
> -------------------------------------------------------------------------=
--------
>
>                 Key: FREEMARKER-21
>                 URL: https://issues.apache.org/jira/browse/FREEMARKER-21
>             Project: Apache Freemarker
>          Issue Type: New Feature
>          Components: engine
>            Reporter: Ondra =C5=BDi=C5=BEka
>
> Repeating stuff is annoying, especially in programming.
> Therefore this is annoying:
> {code}
> <#if someVariable.someMethod.someProperty??>
> <div>${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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