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https://issues.apache.org/jira/browse/FREEMARKER-192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17421953#comment-17421953
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Dániel Dékány edited comment on FREEMARKER-192 at 9/29/21, 6:26 AM:
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Currently we have up to 3 parameters: 1. separator, 2. empty result, 3. list
ending. What we could do in principle is that if there are 4 parameters, then
the meaning of the parameters changes to: 1. separator, 2. empty result, 3.
list starting, 4. list ending. But there the meaning of the parameter 3
changed, which is confusing. Anyway, I don't really a better way. (Would be
much easier and readable if FTL supports named parameters for function calls,
but since {{=}} means the same as {{==}}, we can't add them in backward
compatible way. Unless we use {{:}} instead... Oh well, this is a different
issue.)
was (Author: ddekany):
Currently we have up to 3 parameters: 1. separator, 2. empty result, 3. list
ending. What we could do in principle is that if there are 4 parameters, then
the meaning of the parameters changes to: 1. separator, 2. empty result, 3.
list starting, 4. list ending. But there the meaning of the parameter 3
changed, which is confusing. Anyway, I don't really see another. (Would be much
easier and readable if FTL supports names parameters for function calls, but
since {{=}} means the same as {{==}}, we can't add them in backward compatible
way. Unless we use {{:}} instead... Oh well, this is a different issue.)
> Add a "list beginning" parameter to "join" for sequences
> --------------------------------------------------------
>
> Key: FREEMARKER-192
> URL: https://issues.apache.org/jira/browse/FREEMARKER-192
> Project: Apache Freemarker
> Issue Type: Improvement
> Reporter: Sebastian Schuberth
> Priority: Minor
>
> The "join" built-in on sequences already has a "list ending" optional
> parameter. It should have a corresponding "list beginning" optional parameter
> to conveniently print headers only for non-empty sequences.
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