Scala程序以下面的格式显示输出

Question

在Scala程序中找到缺少的代码，以下列格式显示输出。

输出：

Array[(Int, String)] = Array((4,anar), (5,applelichi), (6,bananagrapes), (7,oranges))

程序

val a = sc.parallelize(List("apple","banana","oranges","grapes","lichi","anar"))

val b = a.map(x =>(x.length,x))

Answer 1

我相信这会给你想要的结果：

a.groupBy(_.length).mapValues(_.sorted.mkString).toArray.sorted

Answer 2

您需要的只是reduceByKey

val a = sc.parallelize(List("apple","banana","oranges","grapes","lichi","anar"))
val b = a.map(x =>(x.length,x)).reduceByKey(_ + _)

应该给你

b: org.apache.spark.rdd.RDD[(Int, String)] = ....
//(4,anar)
//(6,bananagrapes)
//(7,oranges)
//(5,applelichi)