Just in case you were wondering, our fabulous new Set abstraction in JS doesn't have union or intersection http://www.2ality.com/2015/01/es6-set-operations.html …
Now substitute (f) with ((->) t) (a -> b) -> ((->) t a) -> ((->) t b) (a -> b) -> (t -> a) -> (t -> b) ∘
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I appreciate your effort, but I'm still not getting it. I'm a Fire Keramik. What is ((->) t) in words? Something I can look up?
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It is commonly called "reader." Do you know Haskell syntax? map :: (a -> b) -> f a -> f b
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