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willf/ordering.scala

Last active December 20, 2015 03:29
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arbitrary sort orderings using contramaps from scalaz (via Cody Allen)
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ordering.scala
import scalaz.Order
case class WeightedConcept(id: String, weight: Double)
val concepts = List(WeightedConcept("one", 1.0), WeightedConcept("two", 0.5))
val weightOrder: Order[WeightedConcept] = implicitly[Order[Double]].contramap[WeightedConcept](_.weight)
concepts.sorted(weightOrder.toScalaOrdering)
concepts.sorted(weightOrder.reverseOrder.toScalaOrdering)
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