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davidandrzej/lawblog-additup.scala

Last active August 29, 2015 14:04
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lawblog-additup.scala
def addItUp[F : Monoid](items: Seq[F]): F = {
// Combine a bunch of items
val m = implicitly[Monoid[F]]
items.foldLeft(m.zero){case (total, next) => m.append(total,next)}
}
scala> addItUp(Seq("day ", "after ", "day"))
res1: String = "day after day"
scala> addItUp(Seq(1,2,3))
res2: Int = 6
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