aded new examples

Author: TofigBakhshiyev

.gitignore

@@ -1,5 +1,5 @@
-.idea
+.idea/
 
-target
+target/
 
-project
+project/

src/main/scala/FuturesAndPromises/ExampleFirstCompletedOf.scala

@@ -0,0 +1,41 @@
+package FuturesAndPromises
+
+import scala.concurrent.ExecutionContext.Implicits.global
+import scala.concurrent.Future
+import scala.util.{Failure, Success}
+
+/**
+ * A reminder that firstCompletedOf() is non-deterministic and,
+ * it will return any one of the futures which finish first
+ * */
+object ExampleFirstCompletedOf {
+  def checkIsBig(input: Int): Future[Option[Int]] = {
+    Future(
+      if (input > 0) {
+        Some(20)
+      } else {
+        None
+      }
+    )
+  }
+
+  def main(args: Array[String]): Unit = {
+    val futures = List(
+      checkIsBig(1),
+      checkIsBig(-1),
+      checkIsBig(8),
+      checkIsBig(9),
+      checkIsBig(11),
+      checkIsBig(7)
+    )
+
+    // Call Future.firstCompletedOf to get the results of the first future that completes
+    val futureFirstCompletedResult = Future.firstCompletedOf(futures)
+    futureFirstCompletedResult.onComplete {
+      case Success(results) => println(s"Results $results")
+      case Failure(e)       => println(s"Error processing future operations, error = ${e.getMessage}")
+    }
+
+    Thread.sleep(100)
+  }
+}