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dsebban/makeSafe.sc

Last active January 23, 2019 09:46
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Lift a non safe function to a safe one
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makeSafe.sc
def notSafeFunc: String => Int = _.toInt
notSafeFunc("1") // 1
notSafeFunc("a") // java.lang.NumberFormatException: For input string: "a"
import $ivy.`org.typelevel::cats-core:1.5.0`
import cats.implicits._
import cats.Applicative
def makeSafe[A,B,F[_]: Applicative](f: A => B)(implicit F: Applicative[F]): A => F[B] = a => F.lift(f)((F.pure(a)))
import scala.util.Try
val safeFunc = makeSafe[String,Int,Try](notSafeFunc)
safeFunc("a")
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