September 2017 Update

Task/Increment-a-numerical-string/Kotlin/increment-a-numerical-string.kotlin

@@ -0,0 +1,18 @@
+// version 1.0.5-2
+
+/** overload ++ operator to increment a numeric string */
+operator fun String.inc(): String =
+    try {
+        val num = this.toInt()
+        (num + 1).toString()
+    }
+    catch(e: NumberFormatException) {
+        this  // return string unaltered
+    }
+
+fun main(args: Array<String>) {
+    var ns = "12345"
+    println(++ns)
+    ns = "ghijk"  // not numeric, so won't be changed by increment operator
+    println(++ns)
+}