class MapMonoid[K, V] extends Monoid[Map[K, V]]
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def
combine(xs: Map[K, V], ys: Map[K, V]): Map[K, V]
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)
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def
combineAll(xss: IterableOnce[Map[K, V]]): Map[K, V]
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 = ""
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def
combineAllOption(as: IterableOnce[Map[K, V]]): Option[Map[K, V]]
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
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def
combineN(a: Map[K, V], n: Int): Map[K, V]
Return
a
appended to itselfn
times. -
def
empty: Map[K, V]
Return the identity element for this monoid.
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hashCode(): Int
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def
intercalate(middle: Map[K, V]): Semigroup[Map[K, V]]
Between each pair of elements insert middle This name matches the term used in Foldable and Reducible and a similar Haskell function.
Between each pair of elements insert middle This name matches the term used in Foldable and Reducible and a similar Haskell function.
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- Semigroup
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def
isEmpty(a: Map[K, V])(implicit ev: Eq[Map[K, V]]): 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
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ne(arg0: AnyRef): Boolean
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notify(): Unit
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notifyAll(): Unit
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def
repeatedCombineN(a: Map[K, V], n: Int): Map[K, V]
Return
a
combined with itself more than once.Return
a
combined with itself more than once.- Attributes
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- Semigroup
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def
reverse: Monoid[Map[K, V]]
return a semigroup that reverses the order so combine(a, b) == reverse.combine(b, a)
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synchronized[T0](arg0: ⇒ T0): T0
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toString(): String
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