arrow-core/arrow.typeclasses/Monoid

Monoid

interface Monoid<A> : Semigroup<A> (source)

Types

object Companion

Functions

abstract fun A.combine(b: A): A

Combine two A values.

abstract fun empty(): A

A zero value for this A

open fun Collection<A>.fold(): A

Fold an Collection of A values.

open fun fold(elems: List<A>): A

Fold an array of A values.

open fun A.maybeCombine(b: A?): A

open operator fun A.plus(b: A): A