So,
One should be very cautious to use is[blank]!
--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 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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