Operation on List after flatten

问题

I perform a flatten operation on a Seq[JsValue] like:

var rows = (response \\ "rows").head.as[List[List[String]]].flatten

to get the following output:

List(AA                     , BB                        , CC                    ,...)

Basically the response I receive from JSON is that way, so extra spaces will be present to the end of all values. What I actually desire for is:

List(AA, BB, CC, ...)

Is it possible to perform any operation before/instead of flatten to get what I want to achieve? I tried a flatMap and the results were not too desirable.

来源：https://stackoverflow.com/questions/57484474/operation-on-list-after-flatten