Assuming your titles don't have commas in them:

<$list filter="[tag[HelloThere]join[, ]]">
<$text text=<<currentTiddler>>/>
</$list>

On Friday, August 14, 2020 at 4:01:37 PM UTC-7, amreus wrote:
>
> @Mark- I did see that but must not understand.  I would like to create a 
> link for each title in the output.  When I try join, I get a single link 
> with all the titles together. 
>
> My parameterized macro:
>
> \define join-with(sep, filter)
> <$list filter="$filter$ +[first[]]"><$link/></$list><$list 
> filter="$filter$ +[butfirst[]]">$sep$<$link/></$list>
> \end
>
>
> On Friday, August 14, 2020 at 6:50:22 PM UTC-4 Mark S. wrote:
>
>> There is now the join filter operator ...join[,]...
>>
>>
>> On Friday, August 14, 2020 at 3:41:55 PM UTC-7, amreus wrote:
>>>
>>> Was looking for this feature and found in this old thread from 2014. 
>>> Still works.   Is this still the best method for joining a list with a 
>>> separator?
>>>
>>> On Monday, November 17, 2014 at 8:43:01 AM UTC-5 beert...@gmail.com 
>>> wrote:
>>>
>>>> Thanks Stephan, that works.
>>>>
>>>> Here's the final result:
>>>> http://taggly5.tiddlyspot.com/#taginfo
>>>>
>>>> Best wishes, Tobias.
>>>>
>>>

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