Added toMap to TraversableLike.

1 files changed, 17 insertions, 3 deletions

diff --git a/src/library/scala/collection/TraversableLike.scala b/src/library/scala/collection/TraversableLike.scala
index f570c4ca9a..a37341c2b5 100644
--- a/src/library/scala/collection/TraversableLike.scala
+++ b/src/library/scala/collection/TraversableLike.scala
@@ -984,9 +984,7 @@ self =>
   def toList: List[A] = (new ListBuffer[A] ++= thisCollection).toList
 
   /** Converts this $coll to an iterable collection.
-   *
-   *  Note:  Will not terminate for infinite-sized collections.
-   *
+   *  $willNotTerminateInf
    *  @return an `Iterable` containing all elements of this $coll.
    */
   def toIterable: Iterable[A] = toStream
@@ -1015,6 +1013,22 @@ self =>
    */
   def toSet[B >: A]: immutable.Set[B] = immutable.Set() ++ thisCollection
 
+  /** Converts this $coll to a map.  This method is unavailable unless
+   *  the elements are members of Tuple2, each ((K, V)) becoming a key-value
+   *  pair in the map.  Duplicate keys will be overwritten by later keys:
+   *  if this is an unordered collection, which key is in the resulting map
+   *  is undefined.
+   *  $willNotTerminateInf
+   *  @return      a map containing all elements of this $coll.
+   */
+  def toMap[T, U](implicit ev: A <:< (T, U)): immutable.Map[T, U] = {
+    val b = immutable.Map.newBuilder[T, U]
+    for (x <- this)
+      b += x
+
+    b.result
+  }
+
   /** Displays all elements of this $coll in a string using start, end, and separator strings.
    *
    *  @param start the starting string.