t
scalqa

Stream.Flow._extend._filter

trait _filter[A] extends Shared[A]

Filter Interface

Base word let means 'allow only' certain elements trough the pipeline

Base word drop means 'discard' certain elements from the pipeline

Self Type
Stream.Flow[A]
Ordering
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Inherited
  1. Flow._extend._filter
  2. Flow._extend.Z.Shared
  3. scala.AnyRef
  4. scala.Any
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Visibility
  1. Public
  2. All

Method

  1. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  2. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  3. def collect[B](f: PartialFunction[A, B])(implicit arg0: Tag[B]): Flow[B]

    Filter and converter

    Filter and converter

    Only lets elements for which given PartialFinction is defined

    The elements are converted to returned type

    def all = ~~[Any] + "ABC" + 1 + 22.0 + "DE" + 333F + "F"

all.lp                                     // Prints ~(ABC, 1, 22.0, DE, 333.0, F)

all.collect{
    case s: String if (s.length > 1) => s
}.lp                                       // Prints ~(ABC, DE)

    Note. collect always requires double evaluation for each element, so letMap is preferred in many cases

    Definition Classes
    Shared
  4. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  5. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  7. def hashCode(): Int
    Definition Classes
    AnyRef → Any
  8. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  9. abstract def let(f: Filter[A]): Flow[A]

    Main filter

    Main filter

    Only lets elements satisfying the filter

    let is the main filtering method ('filter' is supported for compatibility only)

    (1 to 10).all.let(_ % 2 == 0).lp // Prints: ~(2, 4, 6, 8, 10)
    Definition Classes
    _filter
  10. def letMap[B](f: Mapping[A, Opt[B]])(implicit arg0: Tag[B]): Flow[B]

    Filter and converter

    Filter and converter

    Only lets elements for which given function returns non empty Opt

    The elements are converted to the new type

    def all = "ABC" ~+ "1" + "22" + "D" + "333" + "E"

all.letMap(v => if (v.length < 2) \/ else v).lp // Prints: ~(ABC, 22, 333)

all.letMap({
  case s if (s.length >= 2) => s
  case _                    => \/
}).lp                                           // Prints: ~(ABC, 22, 333)

    Note: letMap is often a faster alternative to collect with PartialFunction, because it is evaluated just once for each element

    Definition Classes
    Shared
  11. def letType[B](implicit t: ClassTag[B]): Flow[B]

    Filter and type converter

    Filter and type converter

    Only lets elements, which are instances of the given type

    Note, the result is mapped to the specified type

    def all = ~~[Any] + "1" + 2 + 3.0 + 4l + "5"

all.lp                  // Prints ~(1, 2, 3.0, 4, 5)

all.letType[String].lp  // Prints ~(1, 5)
    Definition Classes
    Shared
  12. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. final def notify(): Unit
    Definition Classes
    AnyRef
  14. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  15. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  16. def toString(): String
    Definition Classes
    AnyRef → Any
  17. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  18. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  19. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  20. def drop(f: Filter[A]): Flow[A]

    Reversed filter

    Reversed filter

    Discards all the elements satisfying the filter

    (1 to 10).all.drop(_ % 2 == 0).lp // Prints: ~(1, 3, 5, 7, 9)
    Definition Classes
    _filter

Operator

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any