A Far A Far - 6 months ago 80
Scala Question

Scala - convert List of Lists into a single List: List[List[A]] to List[A]

What's the best way to convert a List of Lists in scala (2.9)?

I have a list:


which I want to convert into


How can that be achieved recursively? Or is there any other better way?

Jan Jan

List has the flatten method. Why not use it?

List(List(1,2), List(3,4)).flatten
> List(1,2,3,4)