While there are good documentation on filter, :filter, and :map on tiddlywiki.com , still there are confusions in using them! I would appreciate if through more examples, application of these excellent tools clarified. Conclusion Based on @saqimtiaz clarification, I conclude the below discussion as…

Saq, So, the below shall give correct answer, but it does not: \define mac(scope:"[tag[Filter Operators]]") <$let letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" cond = "$scope$ +[prefix<currentTiddler>]" > <$list filter="[<letters>split[]filter<cond>]"> <$text text=<<currentTiddler>> /> </$…

@twMat Actually it will wrap into a macro and one need to be able to pass different scope! See another example I have given above!

Excuse my stupid question: What can :map be used for?

As they say, Did you “RTFM” :wink:

Two issues that I see: Are there any filter operators starting with uppercase letters? You aren’t using a selection constructor inside the :filter run, start it with all[tiddlers] as by default it only gets a single title as input.

Some links to real world examples here on the forum: Filter operators: inverting input and parameters - #2 by Mark_S How to get the sum of fields of current tiddler [Solved] - #5 by runsy How to sum a data tiddler? - #3 by Mark_S

[image] saqimtiaz: Are there any filter operators starting with uppercase letters? I tried with <<mac "[tag[Learning]]">> where there are output with uppercase, still no result! [image] saqimtiaz: You aren’t using a selection constructor inside the :filter run, start it with all[tiddlers…

[image] saqimtiaz: You aren’t using a selection constructor inside the :filter run, start it with all[tiddlers] as by default it only gets a single title as input. I got the correct result if I go as below \define mac(scope:"") <$let letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" cond = "…

I have concluded this discussion in the original post ( first post in this thread ) I appreciate if Saq ( @saqimtiaz ) kindly read and correct if there is any incorrect conclusion! Any contribution is welcome! I also kindly ask Brian ( @btheado ) if kindly have a look and see if these are can be added …

Clarification: How filter operator, :filter, and :map run prefixes work?

saqimtiaz January 18, 2022, 10:33am 12

Some links to real world examples here on the forum:

Filter operators: inverting input and parameters - #2 by Mark_S
How to get the sum of fields of current tiddler [Solved] - #5 by runsy
How to sum a data tiddler? - #3 by Mark_S