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• foldable.scala

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doobie.util.foldable.scala Maven / Gradle / Ivy

package doobie.util

import scalaz._, Scalaz._

/** Module of additional functions for `Foldable`. */
object foldable {

  /** Generalization of `mkString` for any monoid. */
  def foldSmash[F[_]: Foldable, A](fa: F[A])(prefix: A, delim: A, suffix: A)(implicit ev: Monoid[A]): A =
    ev.append(prefix, ev.append(fa.intercalate(delim), suffix))

  /** Like `foldSmash` but returns monoidal zero if the foldable is empty. */
  def foldSmash1[F[_]: Foldable, A](fa: F[A])(prefix: A, delim: A, suffix: A)(implicit A: Monoid[A]): A =
    if (fa.empty)   A.zero  else foldSmash(fa)(prefix, delim, suffix)

}