Spark's RDD transformations to arrive at a word count solution

WordCount.scala

rdd
  .flatMap(_.split("\\s"))    // Split on any white character
  .map(_.replaceAll(
    "[,.!?:;]", "")           // Remove punctuation and transfer to lowercase
    .trim
    .toLowerCase)
  .filter(!_.isEmpty)         // Filter out any non-words
  .map(word => (word, 1))     // Finally, count words
  .reduceByKey(_ + _)
  .sortByKey()                // and sort the word counts in a lexical order