I notice that the documentation for filter and filterv are emphatic that the predicate you are using be free of side effects. Why is that so? For example, I would like to use filterv to collect a list of lighting effects which respond false to a protocol method which asks whether they have finished. In the implementation of that method, the effects are free to update their internal state based on the current show state and time, when deciding whether or not they are finished, and so I can’t guarantee there will be no side effects while filtering the effects. Does that mean I can’t use filterv? If not, why not? Looking at the source, I see no obvious problems.
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