add examples of toMap to RxScalaDemo

Added examples for all three overloads and removed newlines between
methods and docs

Author: suncelesta

language-adaptors/rxjava-scala/src/examples/scala/rx/lang/scala/examples/RxScalaDemo.scala

@@ -573,4 +573,28 @@ class RxScalaDemo extends JUnitSuite {
     val o : Observable[Seq[Char]] = List("red".toList, "green".toList, "blue".toList).toObservable.elementAtOrDefault(3, "black".toSeq)
     println(o.toBlockingObservable.single)
   }
+
+  @Test def toMapExample1(): Unit = {
+    val o : Observable[String] = List("alice", "bob", "carol").toObservable
+    val keySelector = (s: String) => s.head
+    val m = o.toMap(keySelector)
+    println(m.toBlockingObservable.single)
+  }
+
+  @Test def toMapExample2(): Unit = {
+    val o : Observable[String] = List("alice", "bob", "carol").toObservable
+    val keySelector = (s: String) => s.head
+    val valueSelector = (s: String) => s.tail
+    val m = o.toMap(keySelector, valueSelector)
+    println(m.toBlockingObservable.single)
+  }
+
+  @Test def toMapExample3(): Unit = {
+    val o : Observable[String] = List("alice", "bob", "carol").toObservable
+    val keySelector = (s: String) => s.head
+    val valueSelector = (s: String) => s.tail
+    val mapFactory = () => Map('s'->"tart")
+    val m = o.toMap(keySelector, valueSelector, mapFactory)
+    println(m.toBlockingObservable.single)
+  }
 }

language-adaptors/rxjava-scala/src/main/scala/rx/lang/scala/Observable.scala

@@ -2378,7 +2378,6 @@ trait Observable[+T]
    * @return an Observable that emits a single item: a Map containing the mapped items from the source
    *         Observable
    */
-
   def toMap[K] (keySelector: T => K): Observable[Map[K, T]]= {
     toScalaObservable[Map[K,T]](asJavaObservable.toMap(keySelector))
   }
@@ -2399,7 +2398,6 @@ trait Observable[+T]
    * @return an Observable that emits a single item: a HashMap containing the mapped items from the source
    *         Observable
    */
-
   def toMap[K, V] (keySelector: T => K, valueSelector: T => V) : Observable[Map[K, V]] = {
     toScalaObservable[Map[K,V]](asJavaObservable.toMap(keySelector, valueSelector))
   }
@@ -2419,7 +2417,7 @@ trait Observable[+T]
    * @return an Observable that emits a single item: a Map that contains the mapped items emitted by the
    *         source Observable
    */
-  def toMap[K, V] (keySelector: T => K, valueSelector: T => V, mapFactory: () => Observable[Map[K,V]]): Observable[Map[K,V]] = {
+  def toMap[K, V] (keySelector: T => K, valueSelector: T => V, mapFactory: () => Map[K,V]): Observable[Map[K,V]] = {
     toScalaObservable[Map[K,V]](asJavaObservable.toMap(keySelector, valueSelector, mapFactory))
   }