Affects Version/s: Scala 2.9.1
Fix Version/s: None
Component/s: Documentation and API
Builds a new collection by applying a function to all elements of this $coll and concatenating the results.
Converts this $coll of traversable collections into a $coll in which all element collections are concatenated.
This strong suggests that these methods are equivalent to reduceLeft(_ ++ _), in that the type of the result depends on the type of the elements, not the type of $coll.