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Given a filter method that returns true if some condition is met, is it possible to invoke its opposite in HTML, e.g. to use:
"item in items | filter:!AllDay"
instead of
"item in items | filter:AllDay"
? Or do you have to maintain two separate filter methods (one for false and one for true)?
As noted by ENDOH (this SO question is technically a duplicate), you can negate a filter by prepending ‘!’ to the filter string, like this:
Note that the ‘!’ is quoted. The documentation is not terribly clear on this, and an example there would be helpful.