Simple Word Counter in Scala

	package pelssers.io
	import scala.collection.mutable.Map
	class WordCounter(file: String, ignoredChars: List[Char]) {
	override def toString = s"WordCounter(File=$file, ignoredChars=$ignoredChars)"
	def count:Map[String, Int] = {
	import scala.io.Source
	val result: Map[String, Int] = new scala.collection.mutable.HashMap[String, Int]
	val source = Source.fromFile(file);
	for (line <- source.getLines) {
	for (word <- prepareLine(line).split(" ")) {
	result.update(word, result.getOrElseUpdate(word, 0) + 1)
	}
	}
	result
	}
	def top(number: Int): Seq[(String,Int)] = {
	count.toList.sortBy(r => r._2).reverse.take(number)
	}
	private def prepareLine(line: String): String = {
	val sb = new StringBuffer();
	for (c <- line) {
	sb.append(if (ignoredChars.contains(c)) " " else c)
	}
	sb.toString()
	}
	}
	/** contents of sample.txt
	Working together with leaders of the Play Framework, Akka, and Scala open source communities,
	Typesafe seeks to give developers the modern tools they need to build the next generation of
	software applications for the era of multicore hardware and cloud computing workloads.
	**/
	/** worksheet test
	val wordCounter = new WordCounter("c:/scalademo/sample.txt", List('.', '!', '?'))
	//> wordCounter : pelssers.io.WordCounter = WordCounter(File=c:/scalademo/sample.txt, ignoredChars=List(., !, ?))
	val top3words = wordCounter.top(3)
	//> top3words : Seq[(String, Int)] = List((the,4), (of,3), (and,2))
	**/

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