Class

com.twitter.algebird

EitherSemigroup

Related Doc: package algebird

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class EitherSemigroup[L, R] extends Semigroup[Either[L, R]]

Either semigroup is useful for error handling. if everything is correct, use Right (it's right, get it?), if something goes wrong, use Left. plus does the normal thing for plus(Right, Right), or plus(Left, Left), but if exactly one is Left, we return that value (to keep the error condition). Typically, the left value will be a string representing the errors.

Source
Semigroup.scala
Linear Supertypes
Semigroup[Either[L, R]], Serializable, AnyRef, Any
Known Subclasses
EitherMonoid
Type Hierarchy
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Inherited
  1. EitherSemigroup
  2. Semigroup
  3. Serializable
  4. AnyRef
  5. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new EitherSemigroup()(implicit semigroupl: Semigroup[L], semigroupr: Semigroup[R])

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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any

  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  4. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any

  5. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  6. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  7. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  8. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  9. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any

  10. def hashCode(): Int

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    Definition Classes
    AnyRef → Any

  11. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any

  12. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  13. final def notify(): Unit

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    Definition Classes
    AnyRef

  14. final def notifyAll(): Unit

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    Definition Classes
    AnyRef

  15. def plus(l: Either[L, R], r: Either[L, R]): Either[L, R]

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    Combines two Either[L, R] instances associatively.

    Combines two Either[L, R] instances associatively.

    returns

    result of combining l and r

    Definition Classes
    EitherSemigroup → Semigroup

  16. def sumOption(iter: TraversableOnce[Either[L, R]]): Option[Either[L, R]]

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    Returns an instance of T calculated by summing all instances in iter in one pass.

    Returns an instance of T calculated by summing all instances in iter in one pass. Returns None if iter is empty, else Some[T].

    iter

    instances of T to be combined

    returns

    None if iter is empty, else an option value containing the summed T

    Definition Classes
    Semigroup
    Note

    Override if there is a faster way to compute this sum than iter.reduceLeftOption using plus.

  17. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef

  18. def toString(): String

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    Definition Classes
    AnyRef → Any

  19. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  20. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  21. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from Semigroup[Either[L, R]]

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

Ungrouped