Merge pull request #9546 from alimate/BAEL-4309

BAEL-4309: Invoke Operator Function

core-kotlin-modules/core-kotlin-lang/src/main/kotlin/com/baeldung/operators/Page.kt

@@ -6,6 +6,7 @@ interface Page<T> {
     fun elements(): MutableList<T>
 }
 
+operator fun <T> Page<T>.invoke(index: Int): T = elements()[index]
 operator fun <T> Page<T>.get(index: Int): T = elements()[index]
 operator fun <T> Page<T>.get(start: Int, endExclusive: Int): List<T> = elements().subList(start, endExclusive)
 operator fun <T> Page<T>.set(index: Int, value: T) {

core-kotlin-modules/core-kotlin-lang/src/test/kotlin/com/baeldung/operators/PageTest.kt

@@ -14,6 +14,11 @@ class PageTest {
         assertEquals(page[1, 3], listOf("Kotlin", "Scala"))
     }
 
+    @Test
+    fun `Invoke convention should work as expected`() {
+        assertEquals(page(1), "Kotlin")
+    }
+
     @Test
     fun `In convention should work on a page as expected`() {
         assertTrue("Kotlin" in page)