Packages

c

cats.kernel.instances

ListMonoid

class ListMonoid[A] extends Monoid[List[A]]

Source
ListInstances.scala
Linear Supertypes
Monoid[List[A]], Semigroup[List[A]], Serializable, Serializable, AnyRef, Any
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. ListMonoid
  2. Monoid
  3. Semigroup
  4. Serializable
  5. Serializable
  6. AnyRef
  7. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new ListMonoid()

Value Members

  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
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  6. def combine(x: List[A], y: List[A]): List[A]

    Associative operation which combines two values.

    Associative operation which combines two values.

    Example:

    scala> import cats.kernel.instances.string._
    scala> import cats.kernel.instances.int._
    scala> import cats.kernel.instances.option._
    
    scala> Semigroup[String].combine("Hello ", "World!")
    res0: String = Hello World!
    
    scala> Semigroup[Option[Int]].combine(None, Some(1))
    res1: Option[Int] = Some(1)
    Definition Classes
    ListMonoidSemigroup
  7. def combineAll(xs: IterableOnce[List[A]]): List[A]

    Given a sequence of as, sum them using the monoid and return the total.

    Given a sequence of as, sum them using the monoid and return the total.

    Example:

    scala> import cats.kernel.instances.string._
    
    scala> Monoid[String].combineAll(List("One ", "Two ", "Three"))
    res0: String = One Two Three
    
    scala> Monoid[String].combineAll(List.empty)
    res1: String = ""
    Definition Classes
    ListMonoidMonoid
  8. def combineAllOption(as: IterableOnce[List[A]]): Option[List[A]]

    Given a sequence of as, combine them and return the total.

    Given a sequence of as, combine them and return the total.

    If the sequence is empty, returns None. Otherwise, returns Some(total).

    Example:

    scala> import cats.kernel.instances.string._
    
    scala> Semigroup[String].combineAllOption(List("One ", "Two ", "Three"))
    res0: Option[String] = Some(One Two Three)
    
    scala> Semigroup[String].combineAllOption(List.empty)
    res1: Option[String] = None
    Definition Classes
    MonoidSemigroup
  9. def combineN(x: List[A], n: Int): List[A]

    Return a appended to itself n times.

    Return a appended to itself n times.

    Example:

    scala> import cats.kernel.instances.string._
    
    scala> Monoid[String].combineN("ha", 3)
    res0: String = hahaha
    
    scala> Monoid[String].combineN("ha", 0)
    res1: String = ""
    Definition Classes
    ListMonoidMonoidSemigroup
  10. def empty: List[A]

    Return the identity element for this monoid.

    Return the identity element for this monoid.

    Example:

    scala> import cats.kernel.instances.int._
    scala> import cats.kernel.instances.string._
    
    scala> Monoid[String].empty
    res0: String = ""
    
    scala> Monoid[Int].empty
    res1: Int = 0
    Definition Classes
    ListMonoidMonoid
  11. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  12. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  13. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  14. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  15. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  16. def isEmpty(a: List[A])(implicit ev: Eq[List[A]]): Boolean

    Tests if a is the identity.

    Tests if a is the identity.

    Example:

    scala> import cats.kernel.instances.string._
    
    scala> Monoid[String].isEmpty("")
    res0: Boolean = true
    
    scala> Monoid[String].isEmpty("something")
    res1: Boolean = false
    Definition Classes
    Monoid
  17. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  18. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  19. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  20. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  21. def repeatedCombineN(a: List[A], n: Int): List[A]

    Return a combined with itself more than once.

    Return a combined with itself more than once.

    Attributes
    protected[this]
    Definition Classes
    Semigroup
  22. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  23. def toString(): String
    Definition Classes
    AnyRef → Any
  24. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  25. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  26. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )

Inherited from Monoid[List[A]]

Inherited from Semigroup[List[A]]

Inherited from Serializable

Inherited from Serializable

Inherited from AnyRef

Inherited from Any

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