Problem 06

src/main/scala/ninetyNineScalaProblems/Problem06.scala

@@ -0,0 +1,27 @@
+package ninetyNineScalaProblems
+
+import scala.annotation.tailrec
+
+object Problem06:
+    def isPalindromeList(list: List[Any]): Boolean =
+        @tailrec
+        def loop(cursor: List[Any]): Boolean =
+            cursor match
+                case head :: Nil =>
+                    true
+                case head :: tail =>
+                    tail.reverse match
+                        case e :: t if e == head =>
+                            loop(t)
+                        case e :: t =>
+                            false
+                        case Nil =>
+                            false
+                case Nil =>
+                    true
+
+        loop(list)
+
+object Problem06Stdlib:
+    def isPalindromeList(list: List[Any]): Boolean =
+        list == list.reverse

src/test/scala/ninetyNineScalaProblems/Problem06Suite.scala

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+package ninetyNineScalaProblems
+
+class Problem06Suite extends munit.FunSuite:
+    List(
+        (List(1), true),
+        (List(), true),
+        (List(0, 0, 0), true),
+        (List(5, 4, 3, 4, 5), true),
+        (List(5, 4, 4, 5), true),
+        (List(1, 2, 3, 4, 5), false),
+    ).foreach:
+        case (list, expected) =>
+            test(s"isPalindromeList returns [$expected]"):
+                assertEquals(Problem06.isPalindromeList(list), expected)
+                assertEquals(Problem06Stdlib.isPalindromeList(list), expected)