Question

How to replace a random word in a string with a random word from a list of words using Scala

Answer 1

import scala.util.Random

object ReplaceRandomWord {

  def replaceRandomWord(text: String, replacements: List[String]): String = {
    val words = text.split(" ").toList

    if (words.isEmpty || replacements.isEmpty)
      return text // nothing to do

    val rnd = new Random()

    // Pick random index in the sentence
    val idx = rnd.nextInt(words.length)

    // Pick random replacement word
    val newWord = replacements(rnd.nextInt(replacements.length))

    // Replace it
    val updated = words.updated(idx, newWord)

    // Rebuild the string
    updated.mkString(" ")
  }

  def main(args: Array[String]): Unit = {
    val text = "The quick brown fox jumps over the lazy dog"
    val replacementWords = List("c#", "c++", "java", "rust", "python")

    val result = replaceRandomWord(text, replacementWords)
    println(result)
  }
}

  
  
  
/*
run:
  
The quick brown fox rust over the lazy dog
  
*/

 

 

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