It's looking for unique *values* of the field. Apparently, "nothing" is a value. So the first tiddler for which the value is "nothing" gets included.
I did say it was unintuitive ;-) On Sunday, December 8, 2019 at 12:00:59 PM UTC-8, Mohammad wrote: > > Hi Mark! > But this is confusing! Why it return one tiddler if there is nothing to > return like > > [each[nella]] > > There is no tiddler has field nella, still we have one at the output? > > --Mohammad > > On Sunday, December 8, 2019 at 11:24:32 PM UTC+3:30, Mark S. wrote: >> >> I don't think it's a bug *per se*, but it is unintuitive. >> >> From tiddlywiki.com >> >> As long as the value of the field is unique (i.e. has not been >>> encountered before), the title is appended to the output. >> >> >> and >> >> If a tiddler does not contain field F, it is treated as if the value of >>> the field were empty. >>> >> >> >> Now use filter >> >> [all[tiddlers]limit[1]] >> >> You'll see that $:/library/sjcl.js >> <https://tiddlywiki.com/#%24%3A%2Flibrary%2Fsjcl.js> is the first item >> on the list. >> >> So .... when "each" sees the first item in the list tiddlers, it looks at >> the field "color" in $:/library/sjcl.js. There is no field "color". So >> it saves the "" value on it's list of values that it has seen, and appends >> $:/library/sjcl.js >> >> to the output list. >> >> If you delete $:/library/sjcl.js, you'll see that now "each" returns >> $:/boot/bootprefix.js, >> which is the next tiddler at tiddlywiki.com. >> >> In real use, you would usually be using "each" in conjunction with "get" >> or some other filter, so this would not be a problem. >> >> HTH >> >> >> >> >> >> On Sunday, December 8, 2019 at 11:26:39 AM UTC-8, Mohammad wrote: >>> >>> On https://tiddlywiki.com/#each%20Operator%20(Examples) >>> Look at the first example >>> >>> [each[color]] >>> >>> The output result show >>> >>> $:/library/sjcl.js <https://tiddlywiki.com/#%24%3A%2Flibrary%2Fsjcl.js> >>> >>> But it has no color field! >>> >>> --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]. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/85ed4271-c760-4001-9d86-548ce8a2bee7%40googlegroups.com.
