On Wednesday, March 4, 2020 at 3:39:35 PM UTC+3:30, Jeremy Ruston wrote:
>
> 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]]
>
This is great, and I did not know that!
>
> Best wishes
>
> Jeremy
>
Thanks for clarification
--Mohammad
>
>
> {
> "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 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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