Reverse String in Scala (original) (raw)
Published on 22 March 2019 (Updated: 15 May 2023)
Welcome to the Reverse String in Scala page! Here, you'll find the source code for this program as well as a description of how the program works.
Current Solution
object ReverseString {
// revese using recursive & pattern matching
def reverseString(str: String): String = str.length match {
case 0 => ""
case 1 => str
case _ => reverseString(tail(str)) ++ head(str)
}
def head(str: String): String = str.length match {
case 0 => ""
case _ => str.slice(0, 1)
}
def tail(str: String): String = str.length match {
case 0 => ""
case 1 => ""
case _ => str.slice(1, str.length)
}
def main(args: Array[String]) {
val inputStr: Option[String] = args.length match {
case 0 => None
case _ => Some(args(0))
}
inputStr.map(reverseString).map(println)
}
}
Reverse String in Scala was written by:
- rzuckerm
- Vee Ng
- Viet Thang Nguyen
If you see anything you'd like to change or update, please consider contributing.
How to Implement the Solution
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How to Run the Solution
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