UnorderedFoldable

cats.UnorderedFoldable

See theUnorderedFoldable companion object

trait UnorderedFoldable[F[_]] extends Serializable

UnorderedFoldable is like a Foldable for unordered containers.

Attributes

Companion: object
Source: UnorderedFoldable.scala
Graph
Supertypes: trait Serializable

class Object

trait Matchable

class Any
Known subtypes: trait Foldable[F]

trait Reducible[F]

class NonEmptyReducible[F, G]

trait NonEmptyTraverse[F]

trait Traverse[F]

trait UnorderedTraverse[F]
Show all

Members list

Value members

Abstract methods

Attributes

Source: UnorderedFoldable.scala

Concrete methods

Tests if fa contains v using the Eq instance for A

Attributes

Source: UnorderedFoldable.scala

Count the number of elements in the structure that satisfy the given predicate.

For example:

scala> import cats.syntax.all._
scala> val map1 = Map[Int, String]()
scala> val p1: String => Boolean = _.length > 0
scala> UnorderedFoldable[Map[Int, *]].count(map1)(p1)
res0: Long = 0

scala> val map2 = Map(1 -> "hello", 2 -> "world", 3 -> "!")
scala> val p2: String => Boolean = _.length > 1
scala> UnorderedFoldable[Map[Int, *]].count(map2)(p2)
res1: Long = 2