trait FunctorFilter[F[_]] extends Serializable

FunctorFilter[F] allows you to map and filter out elements simultaneously.

Source
FunctorFilter.scala
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Abstract Value Members

  1. abstract def functor: Functor[F]
  2. abstract def mapFilter[A, B](fa: F[A])(f: (A) ⇒ Option[B]): F[B]

    A combined map and filter.

    A combined map and filter. Filtering is handled via Option instead of Boolean such that the output type B can be different than the input type A.

    Example:

    scala> import cats.implicits._
    scala> val m: Map[Int, String] = Map(1 -> "one", 3 -> "three")
    scala> val l: List[Int] = List(1, 2, 3, 4)
    scala> def asString(i: Int): Option[String] = m.get(i)
    scala> l.mapFilter(i => m.get(i))
    res0: List[String] = List(one, three)

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    protected[java.lang]
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    @native() @throws( ... )
  6. def collect[A, B](fa: F[A])(f: PartialFunction[A, B]): F[B]

    Similar to mapFilter but uses a partial function instead of a function that returns an Option.

    Similar to mapFilter but uses a partial function instead of a function that returns an Option.

    Example:

    scala> import cats.implicits._
    scala> val l: List[Int] = List(1, 2, 3, 4)
    scala> FunctorFilter[List].collect(l){
         |   case 1 => "one"
         |   case 3 => "three"
         | }
    res0: List[String] = List(one, three)
  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def filter[A](fa: F[A])(f: (A) ⇒ Boolean): F[A]

    Apply a filter to a structure such that the output structure contains all A elements in the input structure that satisfy the predicate f but none that don't.

  10. def finalize(): Unit
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    @throws( classOf[java.lang.Throwable] )
  11. def flattenOption[A](fa: F[Option[A]]): F[A]

    "Flatten" out a structure by collapsing Options.

    "Flatten" out a structure by collapsing Options. Equivalent to using mapFilter with identity.

    Example:

    scala> import cats.implicits._
    scala> val l: List[Option[Int]] = List(Some(1), None, Some(3), None)
    scala> l.flattenOption
    res0: List[Int] = List(1, 3)
  12. final def getClass(): Class[_]
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    @native()
  13. def hashCode(): Int
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  14. final def isInstanceOf[T0]: Boolean
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  15. final def ne(arg0: AnyRef): Boolean
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  16. final def notify(): Unit
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    @native()
  17. final def notifyAll(): Unit
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    @native()
  18. final def synchronized[T0](arg0: ⇒ T0): T0
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  19. def toString(): String
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  20. final def wait(): Unit
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    @throws( ... )
  21. final def wait(arg0: Long, arg1: Int): Unit
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    @throws( ... )
  22. final def wait(arg0: Long): Unit
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