Scala doesn't make it easy to abstract over monad-like types, so I wrote a library to fix that. Mercator v0.1.0 is already on Maven Central. Its advantage over other libraries is you don't need to write any typeclass instances. There's also no runtime overhead to using it.pic.twitter.com/bus3sjElPZ
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Thanks, yep!
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Does it also support filter? (guards)
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No, but it should. There's a bit more complexity involved for optional methods (especially withFilter): I don't want to require them, but they should be available to use if they exist.
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at some point Maven Central will charge you on the (LOC / published libraries) ratio
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I might have a word with them about the (time spent coding / time spent publishing) ratio...
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Monadic[Option].pure(null) probably does the wrong thing.
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Is the right thing "None" or "Some(null)"?
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Nice! Now can you make it test the Monad Laws too? ;)
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I'm probably going to make it more permissive rather than less... ;) I want it to have a one-to-one correspondence with types that can be used in a for-comprehension. And these can return different types (à la indexed monads), which I don't support yet.
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