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Alex Rivera
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Note: This is an FAQ, asked specifically so I can answer it myself, as this issue seems to come up fairly often and I want to put it in a location where it can (hopefully) be easily found via a search As prompted by a comment on my answer here For example: "abcde" map {_.toUpperCase} //returns a String "abcde" map {_.toInt} // returns an IndexedSeq[Int] BitSet(1,2,3,4) map {2*} // returns a BitSet BitSet(1,2,3,4) map {_.toString} // returns a Set[String] Looking in the scaladoc, all of these use the map operation inherited from TraversableLike , so how come it's always able to return the most specific valid collection? Even String , which provides map via an implicit conversion.
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