Ha ha!!!!
I thought you asked - what does *each* operator do here.
Now I believe you actually meant - what does the *"each"* operator do here!
Still, it was fun to explain what *each* operator was doing.
Have a great semantic day!
On Monday, April 1, 2019 at 1:27:33 PM UTC+7, Mohammad wrote:
>
> Hi S.S.,
> Many thanks for detailed explanation! I got why you have used *each *
> operator!
> This is actually a doubly sorted list!
> Wonderful!
>
> Added to TW-Scripts
>
> --Mohammad
>
> On Monday, April 1, 2019 at 10:31:39 AM UTC+4:30, S. S. wrote:
>>
>>
>> Mohammad,
>>
>> Well, Michaelha hasn't confirmed that it works yet!
>>
>> What I did was to test a similar scenario in my own TiddlyWiki.
>>
>> I have a bunch of books tagged *book*, that have an *author* field, and
>> a (publication) *year* field.
>> Some authors have multiple books.
>>
>> So I tried to list my books so that it sorted first by the Author name (
>> *author* field), then subsorted the books of an author by the date of
>> publication (*date* field).
>>
>> The below did it quite nicely!
>>
>> <table>
>> <$list filter="[tag[book]each[author]get[author]sort[]]">
>> <$list filter="[tag[book]field:author<currentTiddler>sort[date]]">
>> <tr>
>> <td>
>> //<$link to={{!!title}}><$view field="title"/></$link>//
>> </td>
>> <td>
>> <$view field='author'/>
>> </td>
>> <td>
>> <$view field='date'/>
>> </td>
>> </tr>
>> </$list>
>> </$list>
>> </table>
>>
>> \define Explanation()
>>
>> The 1st *$list* filter:
>>
>> - Gets a list of all my books (tagged *book*)
>> - Looks at the *author* field and gets a list of authors using the
>> *get* operator
>> - Since the *get* operator is one of the few operators that allow
>> duplicates, it is possible to have the same author listed multiple
>> times in
>> the list created
>> - So I first use the *each* operator to ensure unique items
>> (authors).
>> - Then this list of all authors is sorted by the author's name
>> - As we know, *sort[] *sorts by *<<currentTiddler>>* which at
>> this point is the author's name in the *author* field
>>
>> The 2nd *$list* filter will now run for each author in the list created
>> by the 1st *$list*
>>
>> - For the first item (*<<currentTiddler>>* - which is the first
>> author's name)
>> - It first gets a list of all the books (tagged *book*)
>> - Then looks at the *author* field - selects the ones that match
>> this first author (*<<currentTiddler>>*)
>> - Then sorts those ( *sort[date]* ) by the publication date (*date*
>> field)
>> - Then it does that for the 2nd author in the list provided by the
>> 1st *$list* filter
>> - . . . and so on for all the authors one by one as provided by the
>> 1st *$list* filter.
>>
>> \end Explanation
>>
>> I now have a nicely tabled list!
>> I'm glad Michaelha asked the question, as I like the way all my books are
>> listed now.
>>
>> Cheers
>>
>> On Monday, April 1, 2019 at 11:59:36 AM UTC+7, Mohammad wrote:
>>>
>>> S.S,
>>> What does each operator do here?
>>>
>>>
>>>
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