> So, > One should be very cautious to use is[blank]! As Mark points out, the subtlety is that it checks for a zero length string, rather than checking for a missing result. I’m not sure “blank” was necessarily the best word to have chosen; we could always introduce an alias if there’s a clearer word for it.
Best wishes Jeremy > > --Mohammad > > On Tuesday, March 3, 2020 at 7:00:37 PM UTC+3:30, Mark S. wrote: > isblank operates on the output of the new split operator, which might be > "mytitle" "" "someothertitle" "" etc. > > So there has to be a "" to determine if it is blank. > > Most filter operators do not produce "". If something is "", it puts out NO > output -- not even "" > > The operator getindex[xx] produces NO output, and so there is nothing to > evaluate. You get the same result whether you don't use is[blank] . > > So the upshot is, that is[blank] is mostly useful in the context of the split > and splitreg operators. > > On Tuesday, March 3, 2020 at 6:05:18 AM UTC-8, Mohammad wrote: > In tiddlywiki.com <http://tiddlywiki.com/> create a new tiddler titled as > dataTid and set its type as application/json with below contents > { > "xx": "", > "yy": "hello" > } > > > in another tiddler issue the below command > <$list filter="[[dataTid]getindex[xx]is[blank]]" emptyMessage="the index is > NOT blank"> > The index is BLANK > </$list> > > You get the wrong result. Why is[blank] does not detect the blank value of xx? > > > --Mohammad > > -- > 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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tiddlywiki/c7fc0f81-fc26-4ebf-8ef8-f12e84d37b1f%40googlegroups.com > > <https://groups.google.com/d/msgid/tiddlywiki/c7fc0f81-fc26-4ebf-8ef8-f12e84d37b1f%40googlegroups.com?utm_medium=email&utm_source=footer>. -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/0C0F6157-B3D0-4CBC-B766-F6C5D1A6057D%40gmail.com.
