Just using pseudocode to understand the process:
bCount = the number of entries in B
aCount = the number of entries in A *minus 1* (i.e. minus the last entry
which the process always leaves as is, so the last one is ignored)
aLastEntry = the last entry
Result will be the final list
LoopRangeEnd = aCount
<!-- this is the main process -->
Loop, setting nIndex from 1 to LoopRangeEnd *(in steps of 1)*
If item nIndex from A exists in B
Then add item nIndex from A to Result
Otherwise
If nIndex > bCount
Then add the last item from A to Result
Otherwise
Then add item nIndex from B to result
<-- after the main process, tack on the last entry from A -->
Finally, add the last item from A to result
Let me know if that makes sense. If it does, I think I can do that.
On Monday, February 15, 2021 at 5:11:56 AM UTC-4 [email protected]
wrote:
> Ideally "Alternative" would just be overriden by Delta, since it doesn't
> appear in List B
> On Monday, 15 February 2021 at 03:26:34 UTC [email protected] wrote:
>
>> Silly question: If A was : Alpha Beta Alternative Delta, and B was still
>> "Alpha Gamma", what should the final result be?
>>
>> On Sunday, February 14, 2021 at 8:25:57 AM UTC-4 [email protected]
>> wrote:
>>
>>> Hey all
>>>
>>> I've got a situation where I have two lists. List A and List B. I've
>>> specified some dummy info below:
>>>
>>> *A: *Alpha Beta Gamma Delta
>>> *B **(this will change by user input, but for this example:) *Alpha
>>> Gamma
>>>
>>> I want to write a filter to apply to List A where if any item does not
>>> also appear on List B (i.e. in this case Beta and Delta are missing), it is
>>> overwritten by the immediately subsequent value in List A, except the very
>>> last item in List A which is remains in place to act as a default value if
>>> no subsequent value can be found.
>>>
>>> So in this example the filtered version of List A would output as: *Alpha
>>> Gamma Gamma Delta*, because Beta was not present in List B so it is
>>> replaced by the next value of Gamma, and Delta remains because it is at the
>>> very end.
>>>
>>> My question is, is there a way to do this with a static filter
>>> expression? I'm sure I could make something with action-listops widgets
>>> that would do the job when they were activated, but ideally I want
>>> something that updates automatically whenever the user changes List B.
>>>
>>> Any help anyone could provide would be much appreciated.
>>>
>>> Thanks
>>> Joseph
>>>
>>
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