Sampe code for Uniform case string check

scala-core-modules/scala-core-9/src/main/scala/com/baeldung/scala/uniformcase/UniformCaseChecker.scala

@@ -0,0 +1,24 @@
+package com.baeldung.scala.uniformcase
+
+object UniformCaseChecker {
+
+  def convertAndCheck(str: String): Boolean = {
+    str.toUpperCase == str || str.toLowerCase == str
+  }
+
+  def isUpperLowerAndForAll(str: String): Boolean = {
+    val filteredStr = str.filter(_.isLetter)
+    filteredStr.forall(_.isUpper) || filteredStr.forall(_.isLower)
+  }
+
+  def regexCheck(str: String): Boolean = {
+    val filteredStr = str.filter(_.isLetter)
+    filteredStr.matches("^[A-Z]*$") || filteredStr.matches("^[a-z]*$")
+  }
+
+  def countAndCheck(str: String): Boolean = {
+    val filteredStr = str.filter(_.isLetter)
+    filteredStr.count(_.isUpper) == 0 || filteredStr.count(_.isLower) == 0
+  }
+
+}

scala-core-modules/scala-core-9/src/test/scala/com/baeldung/scala/uniformcase/UniformCaseCheckerUnitTest.scala

@@ -0,0 +1,34 @@
+package com.baeldung.scala.uniformcase
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.prop.TableDrivenPropertyChecks
+import UniformCaseChecker.*
+
+class UniformCaseCheckerUnitTest
+  extends AnyFlatSpec
+  with Matchers
+  with TableDrivenPropertyChecks {
+
+  private val fns =
+    Seq(convertAndCheck, isUpperLowerAndForAll, regexCheck, countAndCheck)
+
+  private val table = Table(
+    ("Input", "Expected Result"),
+    ("BAELDUNG @ 2024", true),
+    ("baeldung @ 2024", true),
+    ("Baeldung @ 2024", false),
+    ("2024 @@@ ", true),
+    ("          ", true)
+  )
+
+  it should "check if all characters are upper or lower" in {
+    fns foreach { fn =>
+      forAll(table) { (input, expected) =>
+        withClue("for string: " + input) {
+          fn(input) shouldBe expected
+        }
+      }
+    }
+  }
+}