Not finding missing tiddlers

[Steven Schneider]

I am trying to (not) list tiddlers that (don't) exist.

If I paste this into a new tiddler at http://tiddlywiki.com (or any tiddlywiki most likely): 

<$list filter="[is[tiddler]title[This tiddler does not exist]]">

This tiddler exists: <$link to=<<currentTiddler>>> <<currentTiddler>> </$link><br>

</$list>

<$list filter="[is[missing]title[This tiddler does not exist]]">

This tiddler is missing: <$link to=<<currentTiddler>>> <<currentTiddler>> </$link><br>

</$list>

Given that the tiddlywiki does not have a tiddler with title = "This tiddler does not exist", I would expect to see nothing at all resulting from the first <$list> and a link to a missing tiddler in the second <$list>

Yet, I don't. So I think I'm mis-understanding what [is[tiddler] does, or how <$list> works...

Any help much appreciated,

//steve.

[Mark S.]

Per the docs:

    title is a constructor (except in the form !title)

This means that when you put title[This tiddler does not exist] you actually create a list item.

Switch the filters around:

   [title[This tiddler does not exist]is[tiddler]]

and (2nd filter)

   [title[This tiddler does not exist]is[missing]]

Good luck,

-- Mark

[stevesuny]

Thanks Mark. Works like a charm. Never saw the constructor stuff; I think I get it; but most importantly, I can write <$list> that fail to return results. I do this as kind of an if statement. //steve.