scala - How to create all possible combinations from the elements of a list?

Question

I have the following list:

List(a, b, c, d, e)

How to create all possible combinations from the above list?

I expect something like:

a
ab
abc 

question from:https://stackoverflow.com/questions/13109720/how-to-create-all-possible-combinations-from-the-elements-of-a-list

Answer 1

Or you could use the subsets method. You'll have to convert your list to a set first though.

scala> List(1,2,3).toSet[Int].subsets.map(_.toList).toList
res9: List[List[Int]] = List(List(), List(1), List(2), List(3), List(1, 2), List(1, 3), List(2, 3), List(1, 2, 3))