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51 lines
1.4 KiB
51 lines
1.4 KiB
package green.thisfieldwas.embracingnondeterminism.syntax
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import green.thisfieldwas.embracingnondeterminism.control.Monad
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object monad {
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implicit class FlatMapOps[F[_], A](val fa: F[A]) extends AnyVal {
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/** Convenience method to call `flatMap()` directly on a context.
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*
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* @param f
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* The function to map against instances within the context.
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* @param F
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* The context Monad instance.
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* @tparam B
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* The term of instances contained within the produced context.
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* @return
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* The produced context.
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*/
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def flatMap[B](f: A => F[B])(implicit F: Monad[F]): F[B] = F.flatMap(fa)(f)
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}
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implicit class FlattenOps[F[_], A](val ffa: F[F[A]]) extends AnyVal {
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/** Convenience method to directly flatten a nested context.
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*
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* @param F
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* The context Monad instance.
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* @return
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* The flattened context.
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*/
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def flatten(implicit F: Monad[F]): F[A] = F.flatten(ffa)
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}
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implicit class KleisliCompositionOps[F[_], A, B](val f: A => F[B]) extends AnyVal {
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/** Kleisli composition right-arrow operator.
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*
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* @param g
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* The second function to compose.
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* @param F
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* The context Monad instance.
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* @tparam C
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* The final context term.
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* @return
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* The context produced by the second function `g`.
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*/
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def >=>[C](g: B => F[C])(implicit F: Monad[F]): A => F[C] =
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(x: A) => F.flatMap(f(x))(g)
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}
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}
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