Hi Mohammad
> I assumed the below dataTiddler returns zero length string, but now I
> understood it idoes not! The value of xx is missing!
Indeed, the getindex operator and the get operator both work that way, the
great thing is that it lets you use the else[] operator to provide a fallback
value:
[getindex[xx]else[defaultvalue]match[targetvalue]]
Best wishes
Jeremy
>
> {
> "xx": "",
> "yy": "hello"
> }
>
>
> Best wishes
> --Mohammad
>
> On Wednesday, March 4, 2020 at 2:47:14 PM UTC+3:30, Jeremy Ruston wrote:
>> 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
>>
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