On Wednesday, December 4, 2019 at 6:51:20 AM UTC-8, Mohammad wrote:
>
> I am wondering how to use filter operator THEN, ELSE and ~(else)
> Why the below fails
> <$list filter="[<a>then<b>else<c>]>
>

not sure.  gotta think about this a bit... 

What is the difference between else and ~?
> <$list filter="[<a>else<b>]">
> and 
> <$list filter="[[<a>] ~[<b>]]">
>
 
The big difference here is that else[...] can only substitute a single 
value, while ~[...] can be a complex filter expression

-e

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