Monoid

A monoid is a semigroup with an identity. A monoid is a specialization of a semigroup, so its operation must be associative. Additionally, combine(x, empty) == combine(empty, x) == x. For example, if we have Monoid[String], with combine as string concatenation, then empty = "".

Linear Supertypes

Semigroup[A], Serializable, Serializable, Any

Abstract Value Members

abstract def combine(x: A, y: A): A

Associative operation which combines two values.
Associative operation which combines two values.

Definition Classes
Semigroup
abstract def empty: A

Return the identity element for this monoid.
abstract def getClass(): Class[_]

Definition Classes
Any

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
Any
final def ##(): Int

Definition Classes
Any
final def ==(arg0: Any): Boolean

Definition Classes
Any
final def asInstanceOf[T0]: T0

Definition Classes
Any
def combineAll(as: TraversableOnce[A]): A

Given a sequence of as, sum them using the monoid and return the total.
def combineAllOption(as: TraversableOnce[A]): Option[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).

Definition Classes
Monoid → Semigroup
def combineN(a: A, n: Int): A

Return a appended to itself n times.
Return a appended to itself n times.

Definition Classes
Monoid → Semigroup
def equals(arg0: Any): Boolean

Definition Classes
Any
def hashCode(): Int

Definition Classes
Any
def isEmpty(a: A)(implicit ev: Eq[A]): Boolean

Tests if a is the identity.
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def repeatedCombineN(a: A, n: Int): A

Return a combined with itself more than once.
Return a combined with itself more than once.

Attributes
protected[this]
Definition Classes
Semigroup
def toString(): String

Definition Classes
Any

Related Docs: object Monoid | package kernel

trait Monoid[A] extends Semigroup[A]

Abstract Value Members

abstract def combine(x: A, y: A): A

abstract def empty: A

abstract def getClass(): Class[_]

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def combineAll(as: TraversableOnce[A]): A

def combineAllOption(as: TraversableOnce[A]): Option[A]

def combineN(a: A, n: Int): A

def equals(arg0: Any): Boolean

def hashCode(): Int

def isEmpty(a: A)(implicit ev: Eq[A]): Boolean

final def isInstanceOf[T0]: Boolean

def repeatedCombineN(a: A, n: Int): A

def toString(): String

Inherited from Semigroup[A]

Inherited from Serializable

Inherited from Serializable

Inherited from Any

Ungrouped