Suppose i am having mapping in following way :
[ (1,List[11,12,13]),(2,List[21,22,23]),(3,List[31,32,33]) ]
i want to convert/transform this in the form shown below :
[ (1,11),(1,12),(1,13),(2,21),(2,22),(2,23),(3,31),(3,32),(3,33)]
I am using scala 2.10.4
Use flatMap:
val xs = Array( (1,List(11,12,13)),(2,List(21,22,23)),(3,List(31,32,33)) )
xs.flatMap{ case (s, xs) => xs.map((s,_))}
You can try:
array.flatMap { case (key, arr) => arr.map { key -> _ } }
A solution using for comprehension:
val input = List((1,List(11,12,13)),(2,List(21,22,23)),(3,List(31,32,33)))
val output = for {
tuple <- input
element <- tuple._2
} yield (tuple._1, element)
Maybe you would like this:
for {
(k,arr) <- arrOfTuple
el <- arr
} yield (k -> el)
