Merge pull request #1227 from yadavan88/capitalise-words

Added sample code for sentence capialization

Author: dominiqueplante

scala-strings/src/main/scala/com/baeldung/scala/strings/capitalize/CapitalizeWords.scala

@@ -0,0 +1,28 @@
+package com.baeldung.scala.strings.capitalize
+
+object CapitalizeWords {
+
+  def capitalizeWords(sentence: String): String = {
+    sentence.split("\\s+").map(_.capitalize).mkString(" ")
+  }
+
+  def capitalizeTitleCase(sentence: String): String = {
+    val exclusions = Set("is", "in", "to", "a", "an", "the")
+    sentence
+      .split("\\s+")
+      .zipWithIndex
+      .map { (word, index) =>
+        if (index != 0 && exclusions.contains(word.toLowerCase)) word
+        else word.capitalize
+      }
+      .mkString(" ")
+  }
+
+  def capitalizeWordsPreserveSpaces(sentence: String): String = {
+    sentence.zipWithIndex.map { (char, index) =>
+      if (index == 0) char.toUpper
+      else if (sentence.charAt(index - 1).isSpaceChar) char.toUpper
+      else char
+    }.mkString
+  }
+}

scala-strings/src/test/scala/com/baeldung/scala/strings/capitalize/CapitalizeWordsUnitTest.scala

@@ -0,0 +1,56 @@
+package com.baeldung.scala.strings.capitalize
+
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+import org.scalatest.prop.TableDrivenPropertyChecks
+
+class CapitalizeWordsUnitTest
+  extends AnyFlatSpec
+  with Matchers
+  with TableDrivenPropertyChecks {
+
+  val table = Table(
+    ("Input", "Expected"),
+    ("This is scala 3", "This Is Scala 3"),
+    ("hello world", "Hello World"),
+    ("baeldung   articles", "Baeldung Articles"),
+    ("   ", ""),
+    ("1000", "1000")
+  )
+  it should "capitalize every words of a sentence" in {
+    forAll(table) { (input, expected) =>
+      CapitalizeWords.capitalizeWords(input) shouldBe expected
+    }
+  }
+
+  val tableWithExclusions = Table(
+    ("Input", "Expected"),
+    ("This is scala 3", "This is Scala 3"),
+    ("baeldung   articles", "Baeldung Articles"),
+    ("   ", ""),
+    (
+      "the quick brown fox jumps over the lazy Dog",
+      "The Quick Brown Fox Jumps Over the Lazy Dog"
+    )
+  )
+  it should "capitalize every word of a sentence with exclusion" in {
+    forAll(tableWithExclusions) { (input, expected) =>
+      CapitalizeWords.capitalizeTitleCase(input) shouldBe expected
+    }
+  }
+
+  val tablePreservingSpace = Table(
+    ("Input", "Expected"),
+    ("This is scala 3", "This Is Scala 3"),
+    ("hello world", "Hello World"),
+    ("baeldung   articles", "Baeldung   Articles"),
+    ("   ", "   "),
+    ("1000", "1000")
+  )
+  it should "capitalize every words of a sentence preserving the spaces" in {
+    forAll(tablePreservingSpace) { (input, expected) =>
+      CapitalizeWords.capitalizeWordsPreserveSpaces(input) shouldBe expected
+    }
+  }
+
+}