Question

How to remove the last word from a string with Scala

Answer 1

object RemoveTheLastWordFromAString_Scala {
  def main(args: Array[String]): Unit = {
    var s = "scala java c c++ scala python scala"
    
    s = s.substring(0, s.lastIndexOf(" "))
    
    println(s)
  }
}

 
   
/*
           
run:
     
scala java c c++ scala python
       
*/

 

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Answer 2

object RemoveLastWordApp {

  def removeLastWord(s: String): String = {
    val trimmed = s.replaceAll("\\s+$", "")   // trim trailing spaces

    val lastSpace = trimmed.lastIndexOf(' ')
    if (lastSpace == -1) trimmed
    else trimmed.substring(0, lastSpace)
  }

  def main(args: Array[String]): Unit = {
    var s: String = ""

    s = "c c++ c# java python"
    println("1. " + removeLastWord(s))

    s = ""
    println("2. " + removeLastWord(s))

    s = "c"
    println("3. " + removeLastWord(s))

    s = "c# java python "
    println("4. " + removeLastWord(s))

    s = "  "
    println("5. " + removeLastWord(s))
  }
}


/*
run:

1. c c++ c# java
2. 
3. c
4. c# java
5.  

*/

 

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