Scala中做简易wordCount

Posted 2022-09-10 cosmos-wong

使用foldLeft函数，实现简易的wordCount

import scala.collection.mutable

object Demo_019 
  def main(args: Array[String]): Unit = 
    val list = List("bigdata han hello ", "bigdata han aaa aaa aaa ccc ddd uuu")
    val map01 = mutable.Map[String, Int]()
    list.foldLeft(map01)(count2)
    println(map01)
  

  def count2(map2: mutable.Map[String, Int], str: String): mutable.Map[String, Int] = 
    val arr: Array[String] = str.split(" ")
    for (elem <- arr) 
      map2 += (elem -> (map2.getOrElse(elem, 0) + 1))
    
    map2
  

运行结果为：