[英]Scala- Build collection of tuples of 3 members
我正在学习Scala。 我正在运行一个我想做的例子。
我想收集3个成员的元组。
假设我有一个清单。
val test= List("How","long","are","we","dog","dog")
预期结果:(字,频率,位置)
Map(("How",1,1), ("long",1,2), ("are",1,3), ("we",1,4) ("dog",2,5))
我找不到解决办法:
test.collect{ case (key, v, k ) => (key,indexOf(k),freq)}
不确定您的职位意思是什么,但是以下内容可能会对您有所帮助:
scala> val test = List("How","long","are","we","dog","dog")
test: List[String] = List(How, long, are, we, dog, dog)
scala> test.groupBy(identity).mapValues(_.size).toSeq.sortBy(_._2)
res0: Seq[(String, Int)] = ArrayBuffer((are,1), (How,1), (long,1), (we,1), (dog,2))
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.