Hi Erwan, > It's true that it's a bit counter-intuitive, but I would assume that it's > more common to use "has" or "get" in order to do something with the field > value, and in these cases it's more convenient not to have to check if the > value is empty before using it. That's how I interpreted it at least ;) >
That is true for *get*, but I would not agree that it is for *has*. To me "empty value" is or at least should be a value, meaning: not the same as "undefined". But yes, there are practical applications where I presume one would want to subsume "undefined" as "blank". A) as for *has*: Perhaps the *has *filter operator can be given some *suffix *to tell it to also include those that are blank, e.g. any of: has:field[some-field] Meaning: get all tiddlers that have the field, regardless of whether or not a value is set. B) As for *get*: Not sure, but I believe we cannot add "empty items" to a filter set, e.g. ["foo","","","bar baz"]... for whatever reason... so they essentially get removed. This may be problematic for some situations where you actually want empty items, e.g. if you first iterate titles (in a pseudo-column A) and then again iterate the same number of items (in pseudo-column B) while retrieving a given value with respect to them. At that point, you may not want items to get omitted just because they were empty / or undefined ...but rather want the empty value. One way — assuming that would not break other filters — would be to allow something like: get:empty[some-field] To instruct the iteration to also index blanks, possibly assuming *undefined* to meaning *blank*. So that, if I did: <$list filter="[tag[HelloThere]get[foo]]"> value: <<currentTiddler>> </$list> ...with only one tiddler tagged HelloThere having the field *foo* defined, I would still get a list with the amount of items of whatever number of tiddlers have the tag HelloThere. Best wishes, — tb -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/74912df2-5756-4868-8a80-3117b256672d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
