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Request to Add CoflatMap Instance for Vector #818

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merged 5 commits into from
Jan 19, 2016
Merged

Request to Add CoflatMap Instance for Vector #818

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0864952
cats#813 - Adds CoflatMap type class to the Vector Instance
juanpedromoreno Jan 18, 2016
5d87506
cats#813 - Provides CoflatMap tests for VectorTests
juanpedromoreno Jan 18, 2016
4da172f
cats#813 - Removes non-necessary import
juanpedromoreno Jan 19, 2016
c20f6ed
cats#813 - Changes the coflatMap implementation in order to use ListB…
juanpedromoreno Jan 19, 2016
7ee5f2f
cats#813 - Addresses a code review comment, changing the coflatMap im…
juanpedromoreno Jan 19, 2016
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17 changes: 15 additions & 2 deletions core/src/main/scala/cats/std/vector.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -4,9 +4,13 @@ package std
import cats.data.Streaming
import cats.syntax.show._

import scala.annotation.tailrec
import scala.collection.+:
import scala.collection.immutable.VectorBuilder

trait VectorInstances {
implicit val vectorInstance: Traverse[Vector] with MonadCombine[Vector] =
new Traverse[Vector] with MonadCombine[Vector] {
implicit val vectorInstance: Traverse[Vector] with MonadCombine[Vector] with CoflatMap[Vector] =
new Traverse[Vector] with MonadCombine[Vector] with CoflatMap[Vector] {

def empty[A]: Vector[A] = Vector.empty[A]

Expand All @@ -23,6 +27,15 @@ trait VectorInstances {
override def map2[A, B, Z](fa: Vector[A], fb: Vector[B])(f: (A, B) => Z): Vector[Z] =
fa.flatMap(a => fb.map(b => f(a, b)))

def coflatMap[A, B](fa: Vector[A])(f: Vector[A] => B): Vector[B] = {
@tailrec def loop(builder: VectorBuilder[B], as: Vector[A]): Vector[B] =
as match {
case _ +: rest => loop(builder += f(as), rest)
case _ => builder.result()
}
loop(new VectorBuilder[B], fa)
}

def foldLeft[A, B](fa: Vector[A], b: B)(f: (B, A) => B): B =
fa.foldLeft(b)(f)

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6 changes: 5 additions & 1 deletion tests/src/test/scala/cats/tests/VectorTests.scala
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Original file line number Diff line number Diff line change
@@ -1,13 +1,17 @@
package cats
package tests

import cats.laws.discipline.{MonadCombineTests, SerializableTests, TraverseTests, MonoidalTests}
import cats.laws.discipline.{MonadCombineTests, CoflatMapTests, SerializableTests, TraverseTests, MonoidalTests}
import cats.laws.discipline.eq.tuple3Eq

class VectorTests extends CatsSuite {

checkAll("Vector[Int]", MonoidalTests[Vector].monoidal[Int, Int, Int])
checkAll("Monoidal[Vector]", SerializableTests.serializable(Monoidal[Vector]))

checkAll("Vector[Int]", CoflatMapTests[Vector].coflatMap[Int, Int, Int])
checkAll("CoflatMap[Vector]", SerializableTests.serializable(CoflatMap[Vector]))

checkAll("Vector[Int]", MonadCombineTests[Vector].monadCombine[Int, Int, Int])
checkAll("MonadCombine[Vector]", SerializableTests.serializable(MonadCombine[Vector]))

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