Scala List of tuples to flat list

Question

I have list of tuple pairs, List[(String,String)] and want to flatten it to a list of strings, List[String].

Answer 1

Some of the options might be: concatenate:

list.map(t => t._1 + t._2)

one after the other interleaved (after your comment it seems you were asking for this):

list.flatMap(t => List(t._1, t._2))

split and append them:

list.map(_._1) ++ list.map(_._2)

Answer 2

In general for lists of tuples of any arity, consider this,

myTuplesList.map(_.productIterator.map(_.toString)).flatten

Note the productIterator casts all types in a tuple to Any, hence we recast values here to String.