Files and Text Processing

Counting Words

Count words, characters, and letters in text.

word-count Splitting on spaces counts words, `length` counts characters, and removing the spaces first counts only the letters.

Counting Words

text
WordCount.scala
Replay: real traced execution (multi-file project)
object Main {
  def main(args: Array[String]): Unit = {
    val text = "the quick brown fox"
    val words = text.split(" ").toList
    val chars = text.length
    val letters = text.replace(" ", "").length

    println("words=" + words.length)
    println("chars=" + chars)
    println("letters=" + letters)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val text = "hello world"
    val words = text.split(" ").toList
    val chars = text.length
    val letters = text.replace(" ", "").length

    println("words=" + words.length)
    println("chars=" + chars)
    println("letters=" + letters)
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    val text = "one two three"
    val words = text.split(" ").toList
    val chars = text.length
    val letters = text.replace(" ", "").length

    println("words=" + words.length)
    println("chars=" + chars)
    println("letters=" + letters)
  }
}

  1. text ← the quick brown fox, words ← List(the, quick, brown, fox)

    1object Main {2  def main(args: Array[String]): Unit = {3    val text→ the quick brown fox = "the quick brown fox" //@text="hello world", "one two three"4    val words→ List(the, quick, brown, fox) = textthe quick brown fox.split(" ").toList5    val chars→ 19 = text.length→ 196    val letters→ 16 = textthe quick brown fox.replace(" ", "").length78    println("words=" + words.length4)9    println("chars=" + chars19)10    println("letters=" + letters16)11  }12}
    outputwords=4
chars=19
letters=16

  1. text ← hello world, words ← List(hello, world), chars ← 11, text.length ← 11

    1object Main {2  def main(args: Array[String]): Unit = {3    val text→ hello world = "hello world"4    val words→ List(hello, world) = texthello world.split(" ").toList5    val chars→ 11 = text.length→ 116    val letters→ 10 = texthello world.replace(" ", "").length78    println("words=" + words.length2)9    println("chars=" + chars11)10    println("letters=" + letters10)11  }12}
    outputwords=2
chars=11
letters=10

  1. text ← one two three, words ← List(one, two, three), chars ← 13

    1object Main {2  def main(args: Array[String]): Unit = {3    val text→ one two three = "one two three"4    val words→ List(one, two, three) = textone two three.split(" ").toList5    val chars→ 13 = text.length→ 136    val letters→ 11 = textone two three.replace(" ", "").length78    println("words=" + words.length3)9    println("chars=" + chars13)10    println("letters=" + letters11)11  }12}
    outputwords=3
chars=13
letters=11