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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