wordcount实现

Question

	val txt = scala.io.Source.fromFile("/path/to/wcfile").mkString
	val txts = List(txt)

  val wcMap = txts.flatMap(_.split(","))
    .map(x => (x, 1))
    .groupBy(_._1)

  for((word, wordList) <- wcMap) {
    println(s"$word:${wordList.length}")
  }

Answer 1

Michael_PK 2020-02-07 03:15:27

想想如果不用for呢

• 提问者 chang_bryant #1

  想了个不用for的
  val txt = scala.io.Source.fromFile(
      "/path/to/wcfile").mkString
    val txts = List(txt)
    txts.flatMap(_.split(","))
      .map(x => (x, 1))
      .groupBy(_._1)
      .mapValues(_.length)
      .foreach(x => println(x._1 + ":" + x._2))

• Michael_PK 回复 提问者 chang_bryant #2

  嗯啦！