狠狠撸

scala cats monad functor akka streams future cats-effect io-monad reactive mongodb callback eithert optiont java monad transformer implicit type class haskell rxscala many-to-many slick rxjava completablefuture dotty scala-3 scala-2.13 build tool sbt monix-task task monix validated either applicative reader kleisli monoid composition function freek interpreter dsl adt free monad