List FoldLeftByFoldRight
object FoldLeftByFoldRight { def foldLeft[A, B](l: List[A], z: B)(f: (B, A) => B): B = FoldRight.foldRight(Reverse.reverse(l), z)((a: A, b: B) => f(b, a)) def main(args: Array[String]): Unit = { println(foldLeft(List("1", "2", "3", "4", "5"), "")("(" + _ + _ + ")")) println(foldLeft(List(5), 0)(_ + _)) } }
(((((1)2)3)4)5)
5
posted on 2016-04-20 22:01 JonkeyGuan 阅读(227) 评论(0) 编辑 收藏 举报