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Bind Reader
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| bind<A, B>(f: (v: A) => Functor<B>, functorA: Functor<A>): Functor<B> | |
| // for Reader, it should be | |
| bind<D, A, B>(f: (v: A) => Reader<D, B>, readerA: Reader<D, A>): Reader<D, B> | |
| // Hindley-Milner style | |
| // bind :: (a -> f b) -> f a -> f b | |
| // bind :: (a -> Reader d b) -> Reader d a -> Reader d b | |
| // karena (Reader d b) adalah (d -> b), maka | |
| // bind :: (a -> d -> b) -> (d -> a) -> (d -> b) |
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