Is there a scala list operation that makes tuples from lists?

Question

I\'m trying to process triplets in a list. Imperatively, I could do this:

for(i = 1; i < list.length-1; i++)
{
   process( list[i-1], list[i], list[i+1]          


        

Answer 1

val data = List(1,2,3,4,5,6,7,8,9,10)
val tuples = data.sliding(3).toList
// tuples would be List(List(1,2,3), List(2,3,4), List(3,4,5), List(4,5,6) ... )

Answer 2

I know you got the answer you wanted, but the technically correct answer is no. There's no general method that takes a list and returns tuples of variable arity because there's no way to represent that type signature in Scala at the present.

Answer 3

Pablo's solution isn't entirely correct, you still need to transform the list of lists into a list of tuples:

val data = List(1,2,3,4,5,6,7,8,9,10)
val tuples = data.sliding(3).toList.collect{ case List(x,y,z) => (x,y,z) }
//--> tuples: List[(Int, Int, Int)] = List((1,2,3), (2,3,4), (3,4,5), ...