interface FunctorFilter<F> :
A Functor with the ability to filterMap.
|filter||Apply a filter to a structure such that the output structure contains all A elements in the input structure that satisfy the predicate f but none that don’t.
|filterMap||A combined map and filter. Filtering is handled via Option instead of Boolean such that the output type B can be different than the input type A.
|flattenOption||“Flatten” out a structure by collapsing Options.
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