Extract second tuple element in list of tuples

Question

I have a Map where each value is a list of Tuples such as:

List(('a',1), ('b', 4), ('c', 3)....)

what is the most scala-thonic way to change each value is still a LIst but is only the second element of each Tuple

List(1,4,3)

I have tried

myMap.mapValues(x => x._2)

And I get

error: value _2 is not a member of List[(Char, Integer)]

any tips?

Answer 1

Would that work for you?

val a = List(('a',1), ('b', 4), ('c', 3))
a.map(_._2)

Answer 2

Try this:

    myMap.mapValues(_.map(_._2))

The value passed to mapValues is a List[(Char,Integer)], so you have to further map that to the second element of the tuple.