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Add Show.by #4762

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8 changes: 8 additions & 0 deletions core/src/main/scala/cats/Show.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ import java.util.UUID
import scala.collection.immutable.{BitSet, Queue, Seq, SortedMap, SortedSet}
import scala.concurrent.duration.{Duration, FiniteDuration}
import scala.util.Try
import scala.{specialized => sp}

/**
* A type class to provide textual representation. It is meant to be a
Expand Down Expand Up @@ -65,6 +66,13 @@ object Show extends ScalaVersionSpecificShowInstances with ShowInstances {
*/
def show[A](f: A => String): Show[A] = f(_)

/**
* Convert an implicit `Show[B]` to a `Show[A]` using the given
* function `f`.
*/
def by[@sp A, @sp B](f: A => B)(implicit ev: Show[B]): Show[A] =
a => ev.show(f(a))

/**
* creates an instance of [[Show]] using object toString
*/
Expand Down