Merge pull request #24 from barbasa/master

SCALA-44 Tail recursion in Scala

Author: lor6

core-scala/src/main/scala/com/baeldung/scala/tailrec/StringLength.scala

@@ -0,0 +1,24 @@
+package com.baeldung.scala.tailrec
+import scala.annotation.tailrec
+
+object StringLength {
+
+    def recursiveLength(list: List[String]): Long = list match {
+        case Nil => 0
+        case head :: tail => 1 + recursiveLength(tail)
+    }
+
+    def recursiveLengthVerbose(list: List[String]): Long = list match {
+        case Nil => 0
+        case head :: tail => {
+            val accumulator = recursiveLengthVerbose(tail)
+            1 + accumulator
+        }
+    }
+
+    @tailrec
+    def tailRecursiveLength(list: List[String], accumulator: Long): Long = list match {
+        case Nil => accumulator
+        case head :: tail => tailRecursiveLength(tail, accumulator + 1)
+    }
+}