Hi Mohammad,
A good concrete example could be a followup to your recent template
question. Here, we used the ~[...] construct to *compute* a tiddler title
(or a list thereof):
<$list variable=template filter="[tag[a]] ~[tag[b]] ~[[tid3]]">
<$transclude mode=block tiddler=<<template>> />
</$list>
The computation of tid2 could have been of course arbitrarily more complex
than *[tag[b]].*
If we wanted to use the *else* operator on the other hand, the only thing
we could have done would have been to directly write tiddler titles that
were previously known, like in:
<$list variable=template filter="[tag[a]else[tid2]else[tid3]]">
<$transclude mode=block tiddler=<<template>> />
</$list>
Or at most, got from a variable or a field:
<$list variable=template
filter="[tag[a]else<variable-holding-tid2>else{field-holding-tid3}]">
<$transclude mode=block tiddler=<<template>> />
</$list>
By the way, your test below is indeed intriguing. It looks like the
operator *title* (hidden in the <a> expression) always constructs something
that won't be considered empty by the rest of the filter, whatever the
value of the variable <a> is. In other words, it always returns b. It
sounds like a bug to me :-)
<$list filter="[<a>then<b>else<c>]">
</$list>
-- Xavier
On Wed, Dec 4, 2019 at 8:20 PM Mohammad <mohammad.rahm...@gmail.com> wrote:
> Yes, I hope to see more example to see how they work!
>
> --Mohammad
>
> On Wednesday, December 4, 2019 at 7:36:46 PM UTC+3:30, TiddlyTweeter wrote:
>>
>> Could you give a concrete example? Just asking for a friend :-)
>>
>> On Wednesday, 4 December 2019 16:49:18 UTC+1, PMario wrote:
>>>
>>> Hi,
>>>
>>> then and else are used in a filter run. ~ starts a new run.
>>>
>>> See the docs list
>>> <https://tiddlywiki.com/prerelease/#Filter%20Expression:%5B%5BFilter%20Expression%5D%5D%20%5B%5BFilter%20Syntax%5D%5D%20%5B%5BFilter%20Run%5D%5D%20%5B%5BFilter%20Operators%5D%5D%20%5B%5Bthen%20Operator%5D%5D%20%5B%5Belse%20Operator%5D%5D>
>>> .
>>>
>>> -m
>>>
>>> --
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