Dual

Type tag to choose a scalaz.Monoid instance that inverts the operands to append before calling the natural scalaz.Monoid for the type.

Example:

import scalaz.{@@, Tag, Tags, Dual}
import scalaz.std.string._
import scalaz.syntax.monoid._
import scalaz.Dual._
Dual("World!") |+| Dual("Hello, ") // "Hello, World!"