Filter Run Prefix and Macro Parameter: What is wrong?

[kookma]

1. Open https://tiddlywiki.com/prerelease/
2. Create a new tiddler with below code

\define printf(msg) $(currentTiddler)$ $msg$

\define moreInformation()
<$text text={{{ [[$(currentTiddler)$]links[]count[]] :filter[!match[0]] :map[<printf "links">] [[$(currentTiddler)$]backlinks[]count[]] :filter[!match[0]] :map[<printf "backlinks">] [[$(currentTiddler)$]tags[]count[]] :filter[!match[0]] :map[<printf "tags">] [[$(currentTiddler)$]tagging[]count[]] :filter[!match[0]] :map[<printf "tagging">] +[join[, ]] }}} />
\end

<$tiddler tiddler="HelloThere">
<<moreInformation>>
</$tiddler>

It produces:

8 links backlinks tags tagging, 15 backlinks tags tagging, 1 tags tagging, 6 tagging

Expected result is

8 links, 15 backlinks, 1 tags, 6 tagging

What is going wrong here?

[saqimtiaz]

:map prefix receives all previous results from the filter expression as input, not only from the previous run.

[saqimtiaz]

In this particular case you really don't need such a complex filter construction. Something like the following should be sufficient:

\define moreInformation()
<$text text={{{ [<currentTiddler>links[]count[]!match[0]addsuffix[ links]]
 [<currentTiddler>backlinks[]count[]!match[0]addsuffix[ backlinks]]
 +[join[, ]] }}} />
\end

<$tiddler tiddler="HelloThere">
<<moreInformation>>
</$tiddler>

[kookma]

Thank you Saq! I thought if upstream filter result nothing, then :map will be ignored!

[saqimtiaz]

If ALL upstream filters return nothing then :map will do nothing.